Mass and Weight - Definition, Relation, Difference & Effects of Gravity | [email protected]
People often use "weight" to mean "mass", and vice versa. Because gravity is pretty much the same everywhere on Earth, we don't notice a difference. An object with a mass of 1 kilogram would weigh newtons on Earth, yet it would weigh essentially nothing in space while still having a mass of 1 kilogram. As the gravitational force exerted by Earth is the constant upon which mass is calculated, the values of an object's mass and weight on Earth are approximately .
Unaffected by the strength of gravity. Load-cell based bathroom scale: Affected by the strength of gravity. This is because balances "dual-pan" mass comparators compare the gravitational force exerted on the person on the platform with that on the sliding counterweights on the beams; gravity is the force-generating mechanism that allows the needle to diverge from the "balanced" null point.
These balances could be moved from Earth's equator to the poles and give exactly the same measurement, i. But if you step onto spring-based or digital load cell -based scales single-pan devicesyou are having your weight gravitational force measured; and variations in the strength of the gravitational field affect the reading. In practice, when such scales are used in commerce or hospitals, they are often adjusted on-site and certified on that basis, so that the mass they measure, expressed in pounds or kilograms, is at the desired level of accuracy.
NIST Handbook states: The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it. The pull of gravity on the earth gives an object a downward acceleration of about 9. In trade and commerce and everyday use, the term "weight" is often used as a synonym for "mass.Physics - Are Mass and Weight the same thing?
The use of the term "mass" is predominant throughout the world, and is becoming increasingly common in the United States. Use of the Terms "Mass" and "Weight.
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The term "weight" appears when inch-pound units are cited, or when both inch-pound and SI units are included in a requirement. The terms "mass" or "masses" are used when only SI units are cited in a requirement. The following note appears where the term "weight" is first used in a law or regulation.
BBC - GCSE Bitesize: Mass and force
When used in this law or regulationthe term "weight" means "mass. Added 6" U.
From 21CFR Part This shall be expressed in the terms of weight, measure, numerical count, or a combination of numerical count and weight or measure. The statement shall be in terms of fluid measure if the food is liquid, or in terms of weight if the food is solid, semisolid, or viscous, or a mixture of solid and liquid; except that such statement may be in terms of dry measure if the food is a fresh fruit, fresh vegetable, or other dry commodity that is customarily sold by dry measure.
If there is a firmly established general consumer usage and trade custom of declaring the contents of a liquid by weight, or a solid, semisolid, or viscous product by fluid measure, it may be used. Have you been confusing mass with weight? It's very easy to do when you're not entirely sure of how science actually defines them.
Even though they're both linked, there is a basic difference.
What Is The Difference Between Mass And Weight?
I've put together a fairly comprehensive description for you which, importantly, is written in layman's terms and not scientific babble! Mass is a scientific measure of the amount of matter an object is made up of. No matter where you are at given moment in time, mass is constant. So, whether you're walking to the shop to stock up on groceries or bouncing around on the moon, your mass is the same.
Obviously, if you're on a diet that's not the answer you want to hear but don't panic - we'll get to the all-important definition of weight shortly.
Some other key points about mass Mass is indestructible. As you've seen above, no matter where you are in the universe your mass will never change Mass can never be zero.
What we mean by this is that everything in the universe has mass. If it didn't it simply wouldn't exist Mass is not related to gravity, centrifugal force, etc and these forces have no effect whatsoever on your mass Mass is commonly measured in kilograms and grams. Hopefully, the descriptions above have given you a good idea of what mass really is.
Its numerical value remains constant.
Mass and force
It is a fundamental property of a body and numerical measure of inertia. In physics, we can classify mass into two types namely gravitational mass and inertial mass. If we compare the masses of the body by using a beam balance against standard masses then the gravitational mass of a body could be determined.
The force exerted by the gravity on a body due to which it is pulled towards the Earth is called the weight of a body. It is measured by mass of a body times the acceleration due to gravity. The weight of a body on Earth would remain constant whereas the weight on moon would change as the acceleration due to gravity on moon is one-sixth to that of Earth.