Answer:

1.A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.

2.average value of atmospheric pressure at sea level.

3.Vapor pressure (or equilibrium vapor pressure) is the pressure exerted by a vapor in thermodynamic equilibrium with the condensed phases (solid or liquid) at a given temperature in a closed system. ... A substance with a high vapor pressure at normal temperatures is often referred to as volatile.

4.the action of bringing a liquid to the temperature at which it bubbles and turns to vapor.

5.the point at which anger or excitement breaks out into violent expression.

Explanation:

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