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The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

How many atoms of nitrogen are in the chemical formula ni(w on

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in