Pressure in gases

Gases are more easily compressed than liquids. But if there is so much empty space between molecules, why is any effort at all required to compress them? Why do they exert pressure?

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Views #: 281

Questions #: 15

Time: 15 minutes

Pass Score: 80.0%

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Gas Pressure and Molecular Collisions

1 pts

volume_mute

According to the kinetic theory of gases, why do gases exert pressure on the walls of their container?

Because gas molecules are attracted to the container walls

Because gas molecules are constantly colliding with the container walls

Because gas molecules are stationary and take up space

Because gas molecules expand when heated

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Effect of Molecular Quantity on Pressure

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If the number of gas molecules in an enclosed container is increased while the volume and temperature remain constant, what happens to the pressure exerted by the gas?

Pressure decreases

Pressure remains the same

Pressure increases

Pressure becomes zero

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Effect of Temperature on Gas Pressure

1 pts

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Raising the temperature of a confined gas will increase its pressure. According to kinetic theory, what two factors contribute to this increase?

Molecules become larger and heavier

Each collision with the wall becomes more forceful AND molecules hit the walls more frequently

Molecules stop moving and the gas becomes denser

The gas turns into a liquid and expands

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Atmospheric Pressure Value

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What is the standard atmospheric pressure at sea level, in pounds per square inch (psi)?

14.7 lb/in²

29.9 lb/in²

101 lb/in²

32.0 lb/in²

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Atmospheric Pressure in SI Units

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What is the standard atmospheric pressure at sea level in newtons per square meter (N/m²)?

1.01 × 10⁵ N/m²

1.01 × 10³ N/m²

14.7 × 10⁵ N/m²

101 N/m²

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Why the Atmosphere Doesn't Crush Objects

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The atmosphere exerts a force of about 294 pounds on the palm of your hand. Why isn't your hand crushed by this force?

The hand is made of strong bones

The atmosphere exerts an equal force upward on the underside of the hand

The pressure is only theoretical and doesn't actually exist

The hand is too small to feel the pressure

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Atmospheric Pressure on a Desktop

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volume_mute

A desktop has dimensions 1.5 meters by 1.0 meter. How many newtons of force does the atmosphere exert on the top of this desk at sea level? (Atmospheric pressure = 1.01 × 10⁵ N/m²)

15,000 N

151,500 N

1,515 N

151.5 N

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Atmospheric Pressure Variation with Altitude

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How would atmospheric pressure on a mountain top in Colorado compare to atmospheric pressure at sea level?

It would be greater

It would be the same

It would be less

It would fluctuate randomly

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Air Density at High Altitudes

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Based on the kinetic theory, would you expect the air to be more or less dense on a mountain top compared to sea level?

More dense

Less dense

The same density

Density is not affected by altitude

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Why Air Pressure Changes Differently than Water Pressure

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Unlike pressure in a liquid, atmospheric pressure does not double when you double your depth in the gas. What is the primary reason for this difference?

Gases are invisible

The density of the atmosphere is not constant; it decreases with height

Gases have no weight

The atmosphere is much thinner than any liquid

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Kinetic Theory Analogy

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The kinetic theory uses an analogy of blind bumblebees flying around in a boxcar. What does this analogy represent in a gas?

The colors of different gases

Molecules colliding with the walls of their container

The process of evaporation

The formation of liquids from gases

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Ear Discomfort during Airplane Ascent

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When an airplane ascends quickly, people often feel discomfort in their ears similar to when they dive deep in a pool. What causes this sensation?

Increased temperature at high altitude

The change in air pressure as the plane changes altitude

The speed of the airplane

Lack of oxygen at high altitude

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Force on the Eardrum

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A person's eardrum has an area of about 1/16 square inch. At sea level, what is the approximate total force exerted by the atmosphere on this eardrum? (Atmospheric pressure = 14.7 lb/in²)

14.7 lb

0.92 lb

1.0 lb

235 lb

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Comparing Gas and Liquid Compressibility

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Why are gases more easily compressed than liquids?

Gas molecules are smaller than liquid molecules

Gas molecules are naturally attracted to each other

There is a large amount of empty space between gas molecules

Gas molecules are heavier than liquid molecules

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Why Gases are Less Dense than Liquids

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According to the kinetic theory, why are gases generally less dense than liquids or solids?

Gas molecules are lighter than liquid molecules

The empty space between gas molecules contributes nothing to the weight

Gas molecules are constantly moving

Gases are always hotter than liquids

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Year 9

Gas Pressure and Molecular Collisions

Correct Answer

Explanation

Effect of Molecular Quantity on Pressure

Correct Answer

Explanation

Effect of Temperature on Gas Pressure

Correct Answer

Explanation

Atmospheric Pressure Value

Correct Answer

Explanation

Atmospheric Pressure in SI Units

Correct Answer

Explanation

Why the Atmosphere Doesn't Crush Objects

Correct Answer

Explanation

Atmospheric Pressure on a Desktop

Correct Answer

Explanation

Atmospheric Pressure Variation with Altitude

Correct Answer

Explanation

Air Density at High Altitudes

Correct Answer

Explanation

Why Air Pressure Changes Differently than Water Pressure

Correct Answer

Explanation

Kinetic Theory Analogy

Correct Answer

Explanation

Ear Discomfort during Airplane Ascent

Correct Answer

Explanation

Force on the Eardrum

Correct Answer

Explanation

Comparing Gas and Liquid Compressibility

Correct Answer

Explanation

Why Gases are Less Dense than Liquids

Correct Answer

Explanation

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