Air Pressure and Wind

Front

Atmospheric Pressure Noun

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[at-muh-sfer-ik presh-er]

Back

Atmospheric Pressure

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The pressure caused by the weight of the air in the atmosphere pushing down on Earth and everything on it.

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Example: The image uses a seesaw to show how atmospheric pressure is higher at lower altitudes and lower at higher altitudes.

Front

Atmosphere Noun

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[at-muh-sfeer]

Back

Atmosphere

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The entire layer of gases that surrounds a planet, such as Earth, held in place by the planet's gravity.

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Example: The image shows Earth's atmosphere layers, like the troposphere and stratosphere, surrounding the planet.

Front

Mass Noun

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[mas]

Back

Mass

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The amount of matter or physical substance that makes up an object and gives it weight under gravity.

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Example: A balance scale with a feather and a rock shows how different masses affect weight.

Front

Force Noun

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[fors]

Back

Force

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A push or a pull on an object that can cause it to change its motion, direction, or shape.

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Example: A ball on a slope with arrows shows how force can cause motion.

Front

Gravity Noun

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[grav-i-tee]

Back

Gravity

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The natural force that pulls objects with mass toward each other, such as the force pulling air toward Earth.

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Example: An apple falling from a tree shows gravity pulling it toward the ground.

Front

Compress Verb

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[kuhm-pres]

Back

Compress

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To press or squeeze something, such as a gas, so that it occupies less space or volume.

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Example: A spring being compressed by a hand shows how force can reduce its volume.

Front

Elevation Noun

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[el-uh-vey-shuhn]

Back

Elevation

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The height of a specific point or geographical location, such as a mountain or city, above sea level.

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Example: The image shows how elevation affects air pressure, with a mountain illustrating pressure changes at different heights.

Front

Altitude Noun

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[al-ti-tood]

Back

Altitude

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The height of an object, like an airplane or balloon, above sea level or the ground's surface.

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Example: The image shows how atmospheric pressure decreases as altitude increases, using a mountain and arrows to illustrate pressure differences.

Front

Density Noun

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[den-si-tee]

Back

Density

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A measure of how much mass is contained within a given unit of volume, indicating how tightly packed matter is.

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Example: Objects with different densities float or sink in water, showing how tightly packed their matter is.

Front

Vacuum Noun

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[vak-yoom]

Back

Vacuum

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A space that is completely empty of all matter, including air or any other gases, resulting in zero pressure.

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Example: The vacuum in the flask prevents heat transfer by removing air, illustrating zero pressure.