Where is the piston located when one side is filled with nitrogen N2 and the other side with the same mass of hydrogen H2 at the same temperature

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it

answer///terminator or twilight zone;