Mass vs. Weight: Know the Difference
By Shumaila Saeed || Updated on December 25, 2023
Mass is a measure of the amount of matter in an object, constant everywhere, while weight is the force exerted by gravity on that mass, varying with location.
Key Differences
Mass is a fundamental property of matter that does not change regardless of location. It's a measure of how much matter an object contains. Weight, on the other hand, is a measure of the force exerted on an object's mass by gravity. This force can vary depending on where the object is in the universe due to differences in gravitational pull.
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The value of mass is the same on Earth, the Moon, or in space. It is typically measured in kilograms or grams. Weight changes with the gravitational force acting on it. For example, an object's weight on the Moon is less than its weight on Earth due to the Moon's weaker gravity.
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Mass is a scalar quantity, meaning it has magnitude but no direction. It's an intrinsic property of an object. Weight is a vector quantity, meaning it has both magnitude and direction, directed towards the center of the gravitational source.
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To measure mass, balances are used, comparing the unknown mass to known masses. Weight is measured using scales, which calculate the force of gravity on an object. Thus, scales will give different readings for the same object if used in different gravitational fields.
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The formula to calculate weight is W = mg, where W is weight, m is mass, and g is the gravitational acceleration. The formula emphasizes that weight depends on both the mass of the object and the gravity of the location.
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Mass and Weight Definitions
Mass
Mass is a measure of an object's inertia.
A car has more mass than a bicycle, hence more inertia.
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Weight
Weight changes with the strength of the gravitational field.
The weight of the space shuttle decreases in orbit.
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Mass
Mass is a fundamental property of physical objects.
The planet Earth has a massive mass.
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Weight
A measure of the heaviness of an object
A contest to guess the weight of a pig.
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Mass
Mass is independent of gravity and location.
An astronaut’s mass remains the same in space.
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Weight
The force with which a body is attracted to Earth or another celestial body, equal to the product of the object's mass and the acceleration of gravity.
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Mass
Public celebration of the Eucharist in the Roman Catholic Church and some Protestant churches.
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Weight
A unit measure of gravitational force
A table of weights and measures.
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Mass
A musical setting of certain parts of the Mass, especially the Kyrie, Gloria, Credo, Sanctus, and Agnus Dei.
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Mass
A grouping of individual parts or elements that compose a unified body of unspecified size or quantity
"Take mankind in mass, and for the most part, they seem a mob of unnecessary duplicates" (Herman Melville).
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Weight
(Sports) A heavy object, such as a dumbbell, lifted for exercise or in athletic competition.
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Weight
(Statistics) A factor assigned to a number in a computation, as in determining an average, to increase or decrease the number's effect on the computation, reflecting its importance.
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Mass
Abbr. m(Physics) A property of matter equal to the measure of the amount of matter contained in or constituting a physical body that partly determines the body's resistance to changes in the speed or direction of its motion. The mass of an object is not dependent on gravity and therefore is different from but proportional to its weight.
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Weight
The greater part; preponderance
The weight of the evidence is against the defendant.
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Weight
Influence, importance, or authority
Her approval carried great weight.
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Mass
(Pharmacology) A thick, pasty mixture containing drugs from which pills are formed.
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Mass
Masses The body of common people or people of low socioeconomic status
"Give me your tired, your poor, / Your huddled masses yearning to breathe free" (Emma Lazarus).
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Weight
(Sports) A classification according to comparative lightness or heaviness. Often used in combination
A heavyweight boxer.
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Weight
The heaviness or thickness of a fabric in relation to a particular season or use. Often used in combination
A summerweight jacket.
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Mass
Of, relating to, characteristic of, directed at, or attended by a large number of people
Mass education.
Mass communication.
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Weight
To make heavy or heavier
Our backpacks were weighted down with food and other essentials.
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Weight
To cause to feel concerned, sad, or preoccupied; burden or oppress
He was weighted with guilt.
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Weight
To increase the weight or body of (fabrics) by treating with chemicals.
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Mass
A quantity of matter cohering together so as to make one body, or an aggregation of particles or things which collectively make one body or quantity, usually of considerable size.
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Weight
To cause to have a slant or bias
Weighted the rules in favor of homeowners.
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Mass
(physics) The quantity of matter which a body contains, irrespective of its bulk or volume. It is one of four fundamental properties of matter. SI unit of mass: kilogram.
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Weight
(Sports) To assign to (a horse) the weight it must carry as a handicap in a race.
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Mass
(pharmaceutical drug) A medicinal substance made into a cohesive, homogeneous lump, of consistency suitable for making pills; as, blue mass.
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Weight
The force on an object due to the gravitational attraction between it and the Earth (or whatever astronomical object it is primarily influenced by).
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Mass
(medicine) A palpable or visible abnormal globular structure; a tumor.
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Mass
(bodybuilding) Excess body weight, especially in the form of muscle hypertrophy.
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Weight
A standardized block of metal used in a balance to measure the mass of another object.
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Weight
(weightlifting) An object, such as a weight plate or barbell, used for strength training.
He's working out with weights.
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Weight
(physics) Mass (atomic weight, molecular weight, etc.) in restricted circumstances
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Mass
A large body of individuals, especially persons.
The mass of spectators didn't see the infraction on the field.
A mass of ships converged on the beaches of Dunkirk.
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Mass
(in the plural) The lower classes of persons.
The masses are revolting.
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Weight
(statistics) A variable which multiplies a value for ease of statistical manipulation.
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Weight
(typography) The boldness of a font; the relative thickness of its strokes.
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Weight
(visual art) The relative thickness of a drawn rule or painted brushstroke, line weight.
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Mass
(transitive) To form or collect into a mass; to form into a collective body; to bring together into masses; to assemble.
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Mass
Involving a mass of things; concerning a large quantity or number.
There is evidence of mass extinctions in the distant past.
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Weight
The resistance against which a machine acts, as opposed to the power which moves it.
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Mass
Involving a mass of people; of, for, or by the masses.
Mass unemployment resulted from the financial collapse.
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Mass
The sacrifice in the sacrament of the Eucharist, or the consecration and oblation of the host.
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Mass
The portions of the Mass usually set to music, considered as a musical composition; - namely, the Kyrie, the Gloria, the Credo, the Sanctus, and the Agnus Dei, besides sometimes an Offertory and the Benedictus.
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Mass
A quantity of matter cohering together so as to make one body, or an aggregation of particles or things which collectively make one body or quantity, usually of considerable size; as, a mass of ore, metal, sand, or water.
If it were not for these principles, the bodies of the earth, planets, comets, sun, and all things in them, would grow cold and freeze, and become inactive masses.
A deep mass of continual sea is slower stirredTo rage.
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Mass
A medicinal substance made into a cohesive, homogeneous lump, of consistency suitable for making pills; as, blue mass.
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Mass
A large quantity; a sum.
All the mass of gold that comes into Spain.
He had spent a huge mass of treasure.
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Mass
The principal part; the main body.
Night closed upon the pursuit, and aided the mass of the fugitives in their escape.
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Mass
The quantity of matter which a body contains, irrespective of its bulk or volume.
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Mass
To form or collect into a mass; to form into a collective body; to bring together into masses; to assemble.
But mass them together and they are terrible indeed.
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Mass
The property of a body that causes it to have weight in a gravitational field
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Weight
The quality of being heavy; that property of bodies by which they tend toward the center of the earth; the effect of gravitative force, especially when expressed in certain units or standards, as pounds, grams, etc.
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Mass
(often followed by `of') a large number or amount or extent;
A batch of letters
A deal of trouble
A lot of money
He made a mint on the stock market
It must have cost plenty
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Weight
The quantity of heaviness; comparative tendency to the center of the earth; the quantity of matter as estimated by the balance, or expressed numerically with reference to some standard unit; as, a mass of stone having the weight of five hundred pounds.
For sorrow, like a heavy-hanging bell,Once set on ringing, with his own weight goes.
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Weight
Hence, pressure; burden; as, the weight of care or business.
For the public all this weight he bears.
[He] who singly bore the world's sad weight.
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Mass
(Roman Catholic Church and Protestant Churches) the celebration of the Eucharist
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Weight
Importance; power; influence; efficacy; consequence; moment; impressiveness; as, a consideration of vast weight.
In such a point of weight, so near mine honor.
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Weight
A scale, or graduated standard, of heaviness; a mode of estimating weight; as, avoirdupois weight; troy weight; apothecaries' weight.
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Mass
The common people generally;
Separate the warriors from the mass
Power to the people
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Weight
A ponderous mass; something heavy; as, a clock weight; a paper weight.
A man leapeth better with weights in his hands.
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Mass
The property of something that is great in magnitude;
It is cheaper to buy it in bulk
He received a mass of correspondence
The volume of exports
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Weight
A definite mass of iron, lead, brass, or other metal, to be used for ascertaining the weight of other bodies; as, an ounce weight.
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Weight
The resistance against which a machine acts, as opposed to the power which moves it.
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Mass
A sequence of prayers constituting the Christian eucharistic rite;
The priest said Mass
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Weight
To load with a weight or weights; to load down; to make heavy; to attach weights to; as, to weight a horse or a jockey at a race; to weight a whip handle.
The arrows of satire, . . . weighted with sense.
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Mass
Join together into a mass or collect or form a mass;
Crowds were massing outside the palace
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Weight
To assign a weight to; to express by a number the probable accuracy of, as an observation. See Weight of observations, under Weight.
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Mass
Gathered or tending to gather into a mass or whole;
Aggregate expenses include expenses of all divisions combined for the entire year
The aggregated amount of indebtedness
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Weight
To assign a numerical value expressing relative importance to (a measurement), to be multiplied by the value of the measurement in determining averages or other aggregate quantities; as, they weighted part one of the test twice as heavily as part 2.
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Mass
Mass is the quantity of matter in an object.
The mass of the apple is 100 grams.
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Mass
Mass is what gives objects weight when under gravity.
The mass of a rock determines its weight on Earth.
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Weight
Sports equipment used in calisthenic exercises and weightlifting; a weight that is not attached to anything and is raised and lowered by use of the hands and arms
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Weight
The relative importance granted to something;
His opinion carries great weight
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Weight
An oppressive feeling of heavy force;
Bowed down by the weight of responsibility
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Weight
A unit used to measure weight;
He placed two weights in the scale pan
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Weight
(statistics) a coefficient assigned to elements of a frequency distribution in order to represent their relative importance
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Weight
Present with a bias;
He biased his presentation so as to please the share holders
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Weight
Weight is the gravitational force acting on an object's mass.
The weight of a person varies on different planets.
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Weight
Weight is measured in units of force such as Newtons.
Her weight measured 500 Newtons on Earth.
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Weight
Weight is a vector quantity, having direction towards gravity.
The weight of the apple pulls it downwards.
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Weight
Weight can be calculated using the formula W=mg.
An object's weight increases with its mass and gravity.
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Repeatedly Asked Queries
Does mass change with location?
No, mass is the same regardless of location.
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Nov 19, 2023
Does weight change with location?
Yes, weight changes depending on the gravitational field.
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How does gravity affect weight?
Gravity determines how much force is exerted on a mass, defining its weight.
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What factors affect weight?
Weight is affected by mass and the gravitational field strength.
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Why is mass constant but weight variable?
Mass is an intrinsic property, while weight depends on external gravity.
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Is mass affected by gravity?
No, mass remains constant regardless of gravity.
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Why do astronauts float in space?
Because in space, the gravitational force is much weaker, making their weight almost zero.
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Written by
Shumaila SaeedShumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.
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