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Cards In This Set
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Air is made of _____________ (elements or molecules). their physical state is _____( gas, liquid or solid)
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Molecules. gas.
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What are the components of dry air?
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1. Nitrogen 2. Oxygen 3. Argon 4. carbon dioxide 5. other
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What does dry air mean?(_____ is taken out)
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No water vapor
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What 2 units of concentration are used to describe how much of a certain gas is in the air?
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Ppm= parts per million and percent
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Oxygen is necessary for ________ reactions.what are two examples of this type of reaction?
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Combustion. fire and cars
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Nitrogen and Argon are chemically _____ (reactive, inert). what does this mean?
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Inert. They do not easily chemically react.
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What is atmospheric pressure?
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The pressure exerted by the atmosphere on all objects within it.
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What causes atmospheric pressure?
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The motion of each molecule in the air, which hits or presses on objects.
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What instrument is used to measure atmospheric pressure?
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Barometer
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Name the 2 units that are used to describe atmospheric pressure?
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Atm, and inches of mercury
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What is temperature?
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The measure of an object's motional energy on a molecular level.
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What is heat?
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The transfer of motional energy from one object to another.
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As you add heat to an object you are adding more ______ to that object's molecules.
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Energy
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What is humidity?
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The amount of water in the air.
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The evaporation of water from a surface requires ______. when water evaporates from a surface the surface becomes _____ (cooler/ hotter). explain why this temperature change on the surface happens
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Energy. cooler. energy is required to turn liquid water into water vapor. that energy comes from the surface, which then is a lower temperature since temperature measures the amount of motional energy.
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