Q: Atmospheric pressure at sea level is approximately 1 atm. What is this value in kilopascals?

$$1 \text{ atm} = 101.3 \text{ kPa}$$

Question 1

Which force is primarily responsible for holding Earth's atmosphere close to its surface?

Accepted Answer

Gravitational force

Question 2

Why is air denser at sea level than at higher altitudes?

Accepted Answer

Because the weight of the air above compresses the air below

Question 3

Atmospheric pressure at sea level is approximately 1 atm. What is this value in kilopascals?

Accepted Answer

$$1 	ext{ atm} = 101.3 	ext{ kPa}$$

Question 4

Why don't humans feel the atmospheric pressure pushing on them?

Accepted Answer

Because there is air inside our bodies balancing the external pressure

Question 5

When descending from a mountain, why does a sealed plastic bottle crush inward?

Accepted Answer

The pressure outside the bottle becomes higher than inside

Question 6

How does a vacuum cleaner pick up dust and small particles?

Accepted Answer

By reducing air pressure inside, allowing atmospheric pressure to push particles in

Question 7

When drinking through a straw, what causes the liquid to rise into your mouth?

Accepted Answer

Atmospheric pressure pushes the liquid up due to lower pressure inside the straw

Question 8

If a barometer is moved from sea level to the top of a mountain, what happens to the height of the mercury column?

Accepted Answer

It will be lower

Question 9

Why are barometers typically made with mercury rather than water?

Accepted Answer

Mercury is denser than water, so the column is shorter and more practical

Question 10

What is the maximum height to which water can be drawn up a straw at sea level?

Accepted Answer

$$10.3 	ext{ m}$$

Question 11

According to Boyle's Law, if the volume of a gas is tripled at constant temperature, what happens to its pressure?

Accepted Answer

The pressure is reduced to one-third

Question 12

Which equation represents Boyle's Law for a fixed amount of gas at constant temperature?

Accepted Answer

$$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 13

A scuba diver at a depth of $$10.3 	ext{ m}$$ breathes compressed air. If she holds her breath while returning to the surface, by how much will the volume of her lungs tend to increase?

Accepted Answer

It will increase by a factor of 2

Question 14

Which of the following objects experiences the greatest buoyant force from the atmosphere?

Accepted Answer

A helium-filled party balloon

Question 15

What condition must be met for a hot air balloon to rise in the atmosphere?

Accepted Answer

$$ho_{	ext{air}} \u003e ho_{	ext{balloon}}$$

Question 16

According to Bernoulli's Principle, what happens to the internal pressure of a fluid when its speed increases?

Accepted Answer

Internal pressure decreases

Question 17

When you squeeze the end of a garden hose to make the stream narrower, what happens to the speed of the water?

Accepted Answer

The water speeds up

Question 18

Why can an airplane fly with such a heavy weight?

Accepted Answer

Because its engines provide thrust and its wings generate lift by creating a pressure difference

Question 19

What is plasma?

Accepted Answer

A gas that contains ions and free electrons and is electrically conductive

Question 20

How can plasma be created?

Accepted Answer

By heating gases to very high temperatures or bombarding atoms with high-energy particles

Chapter 14: Gases – Properties, Laws, and Applications

Guida di studio - Domande di pratica

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