Science - The Atmosphere - Air Pressure

What is the difference between how a mercury barometer and an aneroid barometer measure pressure?

A mercury barometer has liquid while a aneroid barometer is supported by air.

Circle the letter of the sentence that helps explain why you would have more difficulty breathing at high altitudes than at sea level.

The amount of oxygen in each breath is less at high altitudes.

Why is air pressure greater at sea level than at the top of a mountain?

Sea level air has the weight of the whole atmosphere pressing down on it. At the top of a mountain the air would have less weight.

Circle the letter of each sentence that is true about air.

- Air has mass because it is composed of atoms and molecules. - Because air has mass, it has density and pressure. - The more molecules in a given volume of air, the greater it's density.

If the air pressure is 30 inches, how many millibars of air pressure are there?

1,016

Two different units used to measure air pressure are:

1. Inches of mercury 2. Millibars

Is the following sentence true or false? Air pressure increases as altitude increases.

False

The relationship among mass, volume, and density.

If volume stay the same, density does the same thing mass does. If volume changes and one of them is different than the other would do the opposite.

Suppose that you are not carrying anything on your back. Why do your shoulders still have pressure on them?

The weight of the atmosphere itself is constantly pressing on your body.

Is the following sentence true or false? As air pressure decreases, so does air density.

True