Most definitely gravity. Gravity is what makes things go up and or down
Answer:
Is their a picture with the question?
Explanation:
Answer:
Gases are compressible, meaning that when put under high pressure, the particles are forced closer to one another. This decreases the amount of empty space and reduces the volume of the gas. Gas volume is also affected by temperature. When a gas is heated, its molecules move faster and the gas expands.
