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Science -Section 1 & 2 Vocabulary

Across
This barometer has an airtight metal chamber whose walls flex in and out in response to the air pressure inside.
The envelope of gases that surrounds the planet.
An instrument that is used to measure air pressure.
When the cells of plants and animals break down food to produce energy, they give off this as a was product.
The force pushing on an area or surface.
Condition of Earths atmosphere at a particular time and place.
The amount of mass in a given volume of air is its density.
Down
This barometer consists of a glass tube open at the bottom end an partially filled with this element.
A form of oxygen that has three atoms in each molecule instead of the usual two.
The result of the weight of a column of air pushing down on an area.
Water in the form of a gas.
The second most abundant gas in the atmosphere.
The most abundant gas in the atmosphere
The distance above sea level, the average level of the surface of the oceans.