Pressure In Liquids And Gases

Question 1

Why is the wall of a dam wider at the bottom than at the top?

Answer 1

The wall is wider at the bottom to make it stronger, as the pressure from the water is greatest at greater depths.

Question 2

How does the force of water coming out from a dam vary with height?

Answer 2

Water coming out from the top of the dam has less force, while water coming out from lower down has more force.

Question 3

What happens to the pressure in water as you go deeper?

Answer 3

The pressure in water increases with depth.

Question 4

Why does pressure increase as you go deeper into a liquid?

Answer 4

There is more liquid above your position, and the weight of the liquid, pushed down by gravity, increases the pressure.

Question 5

How do gravity and the weight of the liquid affect pressure in a liquid?

Answer 5

Gravity causes the weight of the liquid to push on the particles of the liquid, increasing pressure as depth increases.

Question 6

How do particles in a liquid behave when pressure is applied?

Answer 6

The particles move with more force when pushed, and the pressure in the liquid is equal in all directions because the particles are moving randomly.

Question 7

Why is pressure in a liquid equal in all directions?

Answer 7

Because the particles of the liquid move randomly in all directions.

Question 8

What is the initial state of air pressure inside a balloon before you start blowing it up?

Answer 8

The air pressure inside the balloon is the same as the pressure of the air outside, because the balloon is open at one end.

Question 9

What is the initial state of air pressure inside a balloon before you start blowing it up?

Answer 9

The air pressure inside the balloon is the same as the pressure of the air outside, because the balloon is open at one end.

Question 10

What happens to the pressure inside the balloon as you blow more air into it?

Answer 10

The pressure increases as more air particles are added, causing more collisions with the balloon’s walls.

Question 11

How do gas particles in a balloon exert force?

Answer 11

Gas particles move randomly and collide with the walls of the container (the balloon), exerting a small force each time they hit.

Question 12

What causes the pressure inside the balloon to increase?

Answer 12

The increase in the number of gas particles leads to more collisions with the balloon walls, which increases the force on the walls and thus the pressure.

Question 13

How does the pressure inside the balloon affect its shape?

Answer 13

As the pressure increases, it pushes the walls of the balloon outward, making the balloon expand.

Question 14

What does the image of the car tire illustrate about gas pressure?

Answer 14

The flat tire shows that if the pressure of the air inside is too low, it cannot adequately support the weight of the car.

Question 15

Why do particles in a gas move randomly and what effect does this have?

Answer 15

Gas particles are in constant random motion, and their collisions with the container walls generate pressure.

Question 16

What happens to the pressure inside a tire if more air is added?

Answer 16

The pressure increases, causing more collisions with the inside walls of the tire, which pushes the tire outward and supports the vehicle.

Question 17

How does pressure in a gas compare to pressure in a liquid as depth increases?

Answer 17

In both gases and liquids, pressure increases with depth.

Question 18

What is altitude and how does it relate to atmospheric pressure?

Answer 18

Altitude is the height above sea level. As altitude increases, atmospheric pressure decreases.

Question 19

Where is atmospheric pressure the highest and why?

Answer 19

Atmospheric pressure is highest at sea level because the atmosphere is at its deepest there, with the most weight of air pressing down.

Question 20

What two variables change as you go higher in the atmosphere, affecting atmospheric pressure?

Answer 20

1. The number of air particles decreases, reducing the concentration of gas particles.
2. The weight of the air above decreases.

Question 21

How does the pressure at sea level compare to the weight of objects?

Answer 21

Atmospheric pressure at sea level is equivalent to the weight of two large elephants pushing on every square meter of surface.

Question 22

Why don’t we feel the atmospheric pressure around us?

Answer 22

We are constantly surrounded by the atmosphere, so our bodies are used to this pressure.

Question 23

What happens to a metal container when air is pumped out of it?

Answer 23

The pressure inside the container drops close to zero, and the higher atmospheric pressure outside crushes the container.

Question 24

What demonstrates the effect of atmospheric pressure on a container?

Answer 24

When air is removed from a metal container, the container is crushed by the pressure of the air outside.

Question 25

What happens to gas particles as the temperature increases?

Answer 25

The speed of the gas particles increases, causing more frequent and forceful collisions.

Question 26

How does increasing the temperature of a gas affect its pressure?

Answer 26

Increasing the temperature raises the pressure of the gas because the particles collide with more force.

Question 27

How does a pressure cooker use high pressure to cook food?

Answer 27

Water and food are placed inside the sealed pressure cooker. As the water boils, steam cannot escape, which increases the pressure and temperature, speeding up the cooking process.

Question 28

How does a pressure cooker use high pressure to cook food?

Answer 28

Water and food are placed inside the sealed pressure cooker. As the water boils, steam cannot escape, which increases the pressure and temperature, speeding up the cooking process.

Question 29

What components on a pressure cooker help manage pressure?

Answer 29

Weights to control pressure and valves that release steam once the required pressure is reached.

Question 30

Why do submarines that go to great ocean depths need to be very strong?

Answer 30

They must withstand the enormous pressure exerted by the weight of the water above.

Question 31

Why is the wall of a dam thicker at the bottom than at the top?

Answer 31

The pressure of the water is greater at deeper levels, requiring a stronger and thicker structure at the bottom.

Question 32

How does pressure in a liquid change with depth?

Answer 32

Pressure increases as the depth of the liquid increases.

Question 33

Complete the sentence using information about pressure in liquids: When the depth in the liquid doubles, the pressure in the liquid…

Answer 33

also doubles.

Question 34

Which factor causes pressure on a fish in water?

Answer 34

The weight of the water all around the fish (Answer: B).

Question 35

How does air pressure inside a basketball increase?

Answer 35

Air particles inside the ball collide with the inner walls, and as more air is added, the number of collisions increases, raising the pressure.

Question 36

hat happens to the pressure inside a ball when more air is pumped into it?

Answer 36

Pumping more air into the ball increases the number of air particles inside, which leads to more frequent collisions with the walls of the ball, raising the pressure.

Question 37

Why is the pressure inside a ball higher on a hot day than on a cold day?

Answer 37

On a hot day, the temperature increases, causing the air particles inside the ball to move faster and collide more forcefully with the walls, which raises the pressure.

Question 38

Why is the pressure in a vacuum zero?

Answer 38

A vacuum contains no air particles, so there are no collisions occurring with the container walls to create pressure.

Question 39

Why does a metal container collapse when all the air is removed and a vacuum is created inside?

Answer 39

The pressure inside the container is zero, while the external atmospheric pressure remains high, pushing against the walls of the container and causing it to collapse.