26th November 2019

sciencing

17

What is it called when warm air rises and cold air sinks?

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As hot air cools it sinks back to the surface of the earth, where it gets warmed by the ocean only to rise again. This is called a convection current. The main reason that hot air rises is because sinking cold air pushes it up.

Hereof, is hot air lighter or heavier than cold air?

The molecules are packed closer together. The amount of water vapor in the air also affects the density of the air. The more water vapor that is in the air, the less dense the air becomes. That is why cold, dry air is much heavier than warm, humid air.

Which is more dense warm air or cold air?

The absorbed energy makes the molecules in air move and expand, therefore decreasing the airs density. The opposite is true for cold air. It is more dense because the molecules are closer together and they are closer together because the bonds are absorbing less energy and therefore do not move as much.

Which has higher air pressure warm air or cold air?

Temperature also makes changes in air pressure. In cold air, the molecules are more closely packed together than in warm air, so cold air is more dense than warm air. Since warm air is less dense and creates less air pressure, it will rise; cold air is denser and creates greater air pressure, and so it will sink.

1

What happens when warm air rises in the atmosphere?

When warm moist air rises, what should we expect to happen? If warm moist air rises, it will expand and cool. As it cools, the relative humidity will increase and water will condense. The boundaries between warm, moist air and cold, dry air is where storms frequently occur.

2

What is causing the air to rise?

If the air cools to its saturation point, the water vapor condenses and a cloud forms. Heating of the mountain slopes by the Sun also causes air to rise upward. These types of clouds are called "orographic clouds", which develop in response to lifting forced by the topography of the earth.

3

Why does heat rise up?

When we heat air, the molecules jiggle and zip around faster, which causes them to spread out. When a mass of air takes up more space, it has a lower density. Warm air rises when it's surrounded by cold air because of its lower density.

4

What is the rising of hot air and the falling of cold air called?

The rising of hot air/liquid and the falling of cold air/liquid is called a ____________ Convection Current. Hot air/liquid rises because:__________ They are more spaced out, so they are less dense.

5

Is hot air more dense than cold air?

Cold air is denser than warm air. The molecules are packed closer together. The amount of water vapor in the air also affects the density of the air. The more water vapor that is in the air, the less dense the air becomes.

6

What is the main cause of the temperature changes in the atmosphere?

In the troposphere, the source of heat is the surface of the Earth as well as particles in the air which absorb heat and energy from the Sun and release it back into the atmosphere. The ozone layer absorbs radiation from the Sun, helping to increase the temperature in the upper portion of the stratosphere.

7

Why does cooler air sink?

The absorbed energy makes the molecules in air move and expand, therefore decreasing the airs density. The opposite is true for cold air. It is more dense because the molecules are closer together and they are closer together because the bonds are absorbing less energy and therefore do not move as much.

8

Do hot air rise?

Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.

9

Why does hot water tend to rise?

Any object or substance that is less dense than a fluid will float in that fluid, so hot water rises (floats) in colder water. When fluids are cooled, they contract and therefore become more dense. Any object or substance that is more dense than a fluid will sink in that fluid, so cold water sinks in warmer water.

10

Why does warm air always rise at a front?

The lighter warmer air mass begins to rise above the other cooler denser air mass. Warm fronts occur when light, warm air meets cold air. The warm air rises gradually over the cold air as they meet. As the warm air rises it cools and condenses to form clouds.

11

What is the cycle in which air is warmed?

Energy that is transferred when molecules bump into one another. convection cycle. A cycle in which air is warmed, warm air rises, air is cooled, and cool air sinks. hydrosphere. All of the water on Earth's surface.

12

Why does the cold air stay close to the ground?

More specifically, a mass of air that is warmer than the air around it expands, becomes less dense, and will therefore float atop the cooler air. Gas also get cooler as its pressure drops, which it does as it rises up where there is less air pressing down on it. So when warm air rises, it cools off.

13

What is it called when heat is transferred directly from one object to another?

Heat can be transferred from one place to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass. The method used to transfer heat is usually the one that is the most efficient.

14

What causes the warm air to rise and the cold air to sink?

Hot air rises up above the cold air, then gets cold again. On Earth, air that is down near the ground is usually warmer than air further up in the sky, because the oceans warm up the air. So the hot air cools down, and then slowly sinks back down to the ground again.

15

What happens when you mix hot and cold air?

If the boundary between the cold and warm air masses doesn't move, it is called a stationary front. Because cold air is denser than warm air, cold fronts are able to force warm air out more quickly. The cold air pushes the warm air upwards, which may be followed by precipitation or storms due to moisture in the air.

16

Is a hair dryer an example of conduction convection or radiation?

Conduction is heat transfer by direct contact, like frying an egg. Convection is heat transfer by the movement of gases or liquids, like most home furnaces, clothes dryers, or car heaters. Radiation is the transfer of heat in waves through space, like the sun or a fire.

17

Is conduction touching?

If you have ever burned yourself on a hot pan because you touched it, you have experienced this first-hand. Conduction is heat transfer through matter. The heat is transferred by direct contact from the pan, to the oil, to the kernels of popcorn. Convection.

18

What will happen to the air when it is heated?

What happens when air is heated or cooled? So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward. This is the concept used in the hot air balloons.

19

What causes a hot air balloon to rise?

Hot air is less dense than cool air; the heated air causes the balloon to rise simply because it is lighter than an equal volume of cold air. Buoyancy is an upward force that the air exerts, and it helps hot-air balloons and blimps stay in the air. A hot air balloon uses a burner to heat up the air inside the balloon.

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