# 10 what effect does cold air have on air pressure Ideas

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eather School: How Temperature Affects Air Pressure

Pressure: How temperature differences affect pressure

TAMPA, Fla. — Pressure means everything when it comes to forecasting weather and learning about global patterns. High pressure gives us sunny weather and low pressure gives us stormy weather. This lesson will be broken into two parts over the next two weeks. This week will focus on the relationship between temperature and pressure. Next week we will learn about how pressure controls our weather patterns.

First, let’s start off by defining air pressure. It is the weight (force) of the Earth’s atmosphere pressing down on any object on the Earth’s surface. There are many units to describe air pressure. The two most common metric units meteorologist use are “Inches of Mercury (Hg)” or “millibars (mb).” You may hear meteorologist refer to these units when describing the strength of a hurricane. There is a cool tool used to measure air pressure and it is called a barometer.

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Here’s a fun fact! The average atmospheric pressure is 1013.25 mb or 29.92”Hg. What does this mean? It translates down to 14.7 lbs per square inch! Think about that. Take out your pencil and let’s do some quick math. Let’s calculate the approximate weight of the atmosphere over a standard piece of paper with the dimensions of 8.5” x 11”?

Find the area of the piece of paper which equals 93.5 square inches. Multiply that value by 14.7 lbs per square inch and you get a weight of 1,374 pounds of air over that sheet of paper. Now that is a lot of weight!

Did you know more than 2,000 pounds of air is resting on our heads every day? So why aren’t we crushed by it? Thank goodness for a strong vertebrae! Our bodies exert pressure too and these forces are balanced. Equilibrium is a great thing!

Now that you understand the standard pressure of our atmosphere and what it means, let’s talk about how this influences weather. We know that pressure varies greatly around our planet and the pressure difference generates wind and storms.

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Why do we have a change in pressure around the planet? This has to do with temperature and the heating of the planet from the sun. The tilt of our planet causes the globe to heat up at different rates. Some areas like the equator are warmer than others, especially the poles. Cold air is more dense, therefore it has a higher pressure. Warm air is less dense and has a lower pressure associated with it.

As the sun heats the ground, the air near the ground warms. Remember, heat is less dense than cold air so the warm air will rise. This rising motion creates a natural vacuum lowering the air pressure at the Earth’s surface.

Think of a hot air balloon. When you heat the air inside the balloon, it causes the balloon to rise because the heated air is less dense than the colder air around it.

Cold air on the other hand can create large areas of high pressure because cold air is more dense and hovers near the ground. Think back to last week’s lesson when we demonstrated how cold fronts work. The sinking air can create areas of high pressure at the Earth’s surface.

When high pressure is in control, the air sinks. Sinking air compresses the atmosphere and inhibits clouds to form. Sinking air also pushes down toward the ground so the weight above you is greater than on a standard day.

The opposite is true with a low pressure system. With low pressure, air rises, cools, and condenses into storm clouds, which may lead to a rainy day. Since the rising column of air weighs less, the air pressure is lower. Think back to our water cycle lesson. Water vapor rises, cools, condenses into a cloud, and later produces rain.

Let’s demonstrate how temperature pressure relate to one another in this crushing experiment.

Experiment: A collapsing can

Purpose: To demonstrate how pressure changes with temperature

What you need:

– Empty soda can

– Stove top of burner

– Large metal or glass bowl filled with ice water

– Kitchen Tongs

– Goggles, gloves, and apron (protective gear)

Procedure:

1. Fill the empty metal or glass bowl with ice water

2. Turn the stove top to a medium heat

3. Fill the empty soda can with 2 inches of water

4. Place the soda can on the stove top

5. Let the water boil. This is when you will see steam escaping the top of the can

6. With an adult, turn the stove off and use the tongs to take the hot soda can and swiftly flip it over into the bowl filled with ice cold water.

Results: The can crushed immediately after placing it in the bowl of ice cold water.

Conclusion: The heating of the can turned some of the water into water vapor. The warm water vapor was less dense than the surrounding environment causing it to rise out of the can. It was visible as steam. Heating the can causes the water particles to expand and therefore the total volume of water inside the can decreased as much of it was lost due to the water vapor escaping through the top.

When the can was flipped into a pool of ice cold water, the can collapsed on itself. The water vapor that was left inside the can quickly cooled and condensed into water droplets, creating a vacuum. Suddenly the pressure outside the can is greater than inside the can, causing it to collapse on itself!

Next week, we will learn how pressure differences causes the wind to blow.

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## Extra Information About what effect does cold air have on air pressure That You May Find Interested

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### Crushing Can Experiment: How Temps Affects Air Pressure

• Author: baynews9.com

• Rating: 5⭐ (134703 rating)

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• Sumary: Pressure: How temperature differences affect pressure.

• Matching Result: Cold air on the other hand can create large areas of high pressure because cold air is more dense and hovers near the ground. Think back to last …

• Intro: Project Weather School: How Temperature Affects Air PressurePressure: How temperature differences affect pressure TAMPA, Fla. — Pressure means everything when it comes to forecasting weather and learning about global patterns. High pressure gives us sunny weather and low pressure gives us stormy weather. This lesson will be broken into two…

### How Does Temperature Affect Barometric Pressure? – Sciencing

• Author: sciencing.com

• Rating: 5⭐ (134703 rating)

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• Sumary: Barometric pressure is another term for air pressure, or atmospheric pressure. The behavior of air molecules is affected by changes in temperature, resulting in changes in barometric pressure.

• Matching Result: Cool temperatures cause air pressure to drop. When gas molecules cool, they move more slowly. Decreased velocity results in fewer collisions …

• Intro: How Does Temperature Affect Barometric Pressure? The term barometric pressure is synonymous with the term air pressure when describing conditions in the atmosphere, and may also be referred to as atmospheric pressure. Like all matter, air is composed of molecules. These molecules have mass and are subjected to the force…

### Air Pressure Can Change with the Temperature

• Author: web.extension.illinois.edu

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• Sumary:

• Matching Result: Air pressure can also change with the temperature. Warm air rises resulting in lower pressure. On the other hand, cold air will sink making the air pressure …

• Intro: Air Pressure Can Change with the Temperature – Tree House Weather Kids Click on the image to view the large version. Air pressure can also change with the temperature. Warm air rises resulting in lower pressure. On the other hand, cold air will sink making the air pressure higher. This…

### Temperature Affects Air Pressure – NASA

• Author: grc.nasa.gov

• Rating: 5⭐ (134703 rating)

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• Sumary: + Text Only Site + Non-Flash Version + Contact Glenn

• Matching Result: The faster molecules move, the hotter the air. As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when …

• Intro: Temperature Affects Air Pressure + Text Only Site + Non-Flash Version + Contact Glenn  Convection Activities LESSON PLANS created BY: Ken Kakasuleff Frankton Elementary School 405 Sigler Street Frankton, IN 46044 E-mail: kaky@iquest.net Subject Area: PHYSICAL SCIENCE Grade Level: 4-6 National Standards CONTENT STANDARD B: As a result of their…

### Weather or Not: How cold air impacts your tire pressure – KSLA

• Author: ksla.com

• Rating: 5⭐ (134703 rating)

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• Sumary: In this week’s Weather or Not, Meteorologist Kalie Pluchel explains how cold weather can impact your tire pressure.

• Matching Result: This could mean that your tire pressure light pop on when you go out to your car on a chilly morning. How exactly are the two related?

• Intro: Weather or Not: How cold air impacts your tire pressureColder temperatures are moving into the ArkLaTex. You may be thinking about dusting off those winter coats, but have you checked your tire pressure lately?Did you know that as temperatures drop, so does your tire pressure? This could mean that your…
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## Frequently Asked Questions About what effect does cold air have on air pressure

If you have questions that need to be answered about the topic what effect does cold air have on air pressure, then this section may help you solve it.

### How does the pressure of cold air change?

Warm air is less dense and has a lower pressure because it is in comparison to cold air, which is more dense and therefore has a higher pressure.

### Why does cold cause low air pressure?

As the temperature drops, air molecules move closer together and occupy less space in a tire, resulting in a lower pressure. Cold air is more dense and takes up less space in objects like a basketball or a car tire.

### Does low air pressure feel cold or hot?

It also explains why air gets colder at higher altitudes where pressure is lower: if air pressure decreases, the temperature decreases.

### Does a cold front cause an increase in air pressure?

The barometric pressure typically drops as a cold front approaches and rises after it passes. In extreme cases, temperatures can drop 30 degrees or more in a matter of hours and dozens of degrees Fahrenheit in a matter of minutes.

### Does warm air have higher pressure than cold air?

Warm air is therefore lighter (less dense) than cold air, and as a result, exerts less pressure. Greater activity of the heated molecules increases the spacing between neighboring molecules and subsequently decreases air density.

### Air pressure is it increased by heat?

When the atmosphere is heated, the same thing happens: some air molecules leave or float away, resulting in decreased air pressure.

### Does cold connote high pressure?

For instance, a high pressure system will typically bring fine, warm weather in the summer but cold, dry days and frost in the winter.

### What causes air with low pressure?

Air rising and falling causes areas of high and low pressure. As air warms, it rises, causing low pressure at the surface. As air cools, it descends, causing high pressure at the surface.

### What temperature is high pressure?

Low pressure systems force air from the surface high into the atmosphere, where it cools and condenses to produce clouds. Thunderstorms and winter storms are associated with low pressure systems. High pressure systems are typically associated with warm and dry conditions.

### Does pressure rise more in the hot or cold?

Due to temporary blood vessel narrowing brought on by low temperatures, which is necessary to force blood through congested veins and arteries, blood pressure is typically higher in the winter and lower in the summer.

### Does frigid air rise or sink?

According to conventional wisdom, warm air rises while cold air sinks; however, a study from the University of California, Davis, discovered that cold air rises in the tropical atmosphere due to an underappreciated effect: the lightness of water vapor.

### What causes an increase in air pressure?

Any container that has been heated will have the ability to transfer energy to the air molecules, which will cause them to move faster and exert more force on the container’s boundary, leading to an increase in pressure.

### What results in a drop in air pressure?

Changes in humidity also have an impact on air pressure; as humidity rises, air pressure falls because water molecules have a lower mass than the oxygen and nitrogen molecules that make up most of dry air. Air pressure always decreases as you ascend because there is less atmosphere above you.

### What primarily affects air pressure?

1) Temperature, altitude or elevation, and moisture or water vapour are the three main variables that influence barometric (air) pressure.