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Mass and weight are two different quantities and one should not confuse one with the other. Firstly weight is a vector quantity and mass is a scalar and therefore invariant with respect to location. In fact it can be used as a measure of inertia. Weight is equal to the force of gravity acting on a body and does vary with a body's location (altitude, latitude and with the value of gravitational acceleration and so on). This difference can be understood by looking at their respective definitions.

m(gravitational) = W/g and m'(inertial)= F/a

A given body can be weightless (a reaction less state, to be exact) but it cannot be mass less.

Our weight on the moon, for example would be 1/6 that on the earth but our masses on earth or moon would be the same ant it would require the same force to accelerate us on the earth or the moon.

Answer

Mass is constant, weight is relative. Two objects with the same mass will weigh differently if one is weighed on the Earth and the other on the Moon, due to gravity.

Answer

The replies above are from the perspective of Physics. In Chemistry, we don't pay much attention to physics. We're looking at the view of the chemicals' reactions versus how gravity or inertia assists. So in Chemistry the weight of an object is the same as it's mass, assuming we're on earth at the same pressure (which earth = 1 atm). There for If I ask for 1 gram of Silicon, the mass is 1 gram and the weight is also 1 gram.
Mass: the SI unit of mass is the kilogram. The meaning of mass is quantity of matter.

Weight: the SI unit of weight is newton. The meaning of weight is the gravitational force applied to an object.

1 newton (N) is 1 kg.m/s2.

On the Earth surface: weight = mass x 9,80665

Also, while mass is a scalar quantity, weight is a vector quantity hence they aren't the same.

In Physics, both mean different.

Mass is the one is the actual content of any substance. It will never change irrespective of its location. Mass will be same for a given substance in earth, moon or wherever it be)

But, Weight is the fuction of Mass which is a force felt based on the gravitational pull on that particular location.

Example: A object weighing 6 lb in Earth will weigh 1lb in moon. Because the gravity is 6 times less in moon compared to that of earth.

Of course not! While your mass stays the same your weight depends on an attractive force. For example on the Moon you will weight much less than on the Earth but your mass would be constant (of course if you not on a diet:))


If your weight is 52 kg on earth you will weigh 0 kg on the moon or in outer space because there is no gravitational pull...:]
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