Using particle theory, predict how temperature and pressure affect the density of a fixed mass

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What is the mass of sodium in 3 moles of sodium chloride

What is an example of a physical property?

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?