What causes gas pressure in a container such as a helium balloon?

Conversely cold air sinks. ... It is the collisions of the air molecules with the inside walls of the balloon that keep the balloon inflated. In A. The pressure produced by the air molecules inside a balloon will first depend on the number of air molecules, N, in the balloon.

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.

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