Question

The fact that, in general, liquids and gases expand when heated gives rise to:

Answer 1

which is the answer: A) convection currents in fluids due to changing masses.
B) convection currents in fluids due to changing densities.
C) heat transfer by conduction.
D) convection currents in fluids due to constant temperatures.

Answer 2

B

gravity effectively pulls harder on a given volume of a denser gas or fluid than it does on a equal volume of less dense gas or fluid. this is what causes warmer air to rise and is the basis of the weather system and winds.