An astronaut carries a metal block from the Earth to the Moon. Which physical quantity of the block remains the same throughout the journey?
Mass
Mass is the quantity of matter in a body; it does not depend on location, so the block’s mass is the same on Earth and on the Moon.
Weight (W = mg) changes because g on the Moon is about one-sixth of that on Earth.
The gravitational force acting on the block is its weight, so it changes in the same way.
Atmospheric pressure changes too: about 101 kPa at Earth’s surface and practically zero on the Moon, which has almost no atmosphere.
Hence, the answer is Mass.
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