About the question:
What weighs more, 1 Kilogram of feather or 1 Kilogram of gold ?
Answer is = find out :-p
Air plays a role here.
Mass and Weight are 'Different'
When volume is large, it displaces more air.
Read wikipedia.
en.wikipedia.org/wiki/Mass_versus_weight
About Buoyancy:
The masses of objects are relatively invariant whereas their weights vary slightly with changes in barometric pressure, such as with changes in weather and altitude. This is because objects have volume and therefore have a buoyant effect in air. Buoyancy—a force that opposes gravity—reduces the weight of all objects immersed in fluids. This means that objects with precisely the same mass but with different densities displace different volumes and therefore have different buoyancies and weights.
Normally, the effect of air buoyancy is too small to be of any consequence in normal day-to-day activities. For instance, buoyancy's diminishing effect upon one's body weight (a relatively low-density object) is 1/860 that of gravity and variations in barometric pressure rarely affect one's weight more than 1 part in 30,000.[
weight:
Because mass and weight are separate quantities, they have different units of measure. In the International System of Units (SI), the kilogram is the unit of mass, and the newton is the unit of force.
When an object's weight (its gravitational force) is expressed in kilograms, the unit of measure is not a true kilogram; it is the kilogram-force (kgf or kg-f), also known as the kilopond (kp), which is a non-SI unit of force.
And if I remember correctly; Mass = dravyamaan, Weight =vajan
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