What are we referring to at the particle level when talking about the pressure of a gas?

Well, when something is in gas state, the particles move very quickly and freely and bounce around a lot, more than in liquids and solids.

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why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.