# Does air have a weight?

Although it may not appear so, air has weight. Anything that has mass has weight, and we know that air has mass because we can feel it when the wind blows. The whole weight of the atmosphere produces a pressure of around 14.7 pounds per square inch at sea level. This is called atmospheric pressure.

Atomic weights are the weights of the individual atoms which make up substances. Atomic weights were first calculated by English chemist John Dalton in 1814. He showed that the weight of any substance must be equal to the sum of its atomic weights.

The average weight of an atom of carbon is 12.0107984. The average weight of an atom of oxygen is 15.9949399. The average weight of an atom of nitrogen is 7.0372440. These figures were determined using calculations based on the known masses of various chemical elements and their compounds. They can be considered as approximate values since no two atoms of a given element will usually be identical in weight. For example, the average weight of atoms of carbon in a given sample of coal might be slightly less than 12 because some atoms are missing or more than 12 because other atoms are present in large numbers.

The exact weight of a single molecule of gas is too small to be measured with current technology but it can be estimated from experimental data and theoretical considerations. A typical single molecule of oxygen weighs about 30 amu (atomic mass units).

## Can you feel the weight of the air?

As a result, the pressure in the atmosphere is the same as if you were resting beneath 10 meters of water. We don't, however, feel the weight of the atmosphere. This is due to the fact that the pressure presses in all directions. So although the pressure is high above you, it's low enough below that your feet can walk through it without any problem.

The average human body weighs about 50 pounds or 23 kilograms. At sea level, with no wind and no weather conditions, the pressure is roughly 1 kilopascal (kPa). This means that for every square inch of surface, you are being pressed by one kilogram (2.2 pounds) of force.

At higher altitudes, where there is less oxygen present, people can hold their breath for longer periods. According to NASA, "the maximum duration of continuous breathing under normal conditions is about 20 minutes at an altitude of 10,000 feet (3,048 m), but individuals can stay submerged in water for more than an hour."

At even higher altitudes, where there is even less oxygen, people need mechanical assistance to breathe. A person who is not trained will die after about eight hours at this level.

So basically, yes, you can feel the weight of the air. It's just so slight that you wouldn't think much of it unless you were aware of it.

## Why is the weight of air called "air pressure"?

The weight of air is referred to as air pressure. Because air is made up of many gases, it has a certain weight. Air pressure is the weight of air on any unit of area on Earth, and it is measured in millibars. Air expands in the summer owing to high temperatures and contracts in the winter due to low temperatures. This action of the air on buildings and vehicles provides most of the energy that drives weather systems across the planet.

Air pressure is one of the five forces that drive the earth's climate (the other four being clouds, radiation, heat flow, and water vapor). As air rises, it becomes less dense than surrounding objects, so it lifts them with it. The air above an object will be under greater tension than the air next to it, so it stretches outwards until all the surrounding air is at the same pressure.

This is why balloons rise; the gas inside them is lighter than air so it escapes from the balloon and allows the ballon to float up into the sky.

At sea level, the atmospheric pressure is 100 millibars. This means that for every square meter of surface area, there are 100 newtons of force acting perpendicular to the surface. For example, if you lifted a weight of 1 kilo using a lift of 10 meters, you would need 10 newtons of force!

At higher altitudes, where the air is thinner, there is less pressure over a given area.

## What are the characteristics of air?

Air is composed of gases. There is mass in air. Air has weight and exerts pressure. It is possible to compress air. Heat can be transferred from air to another substance or between two substances by conduction, radiation, or convection.

The three main components of air are nitrogen (78%), oxygen (21%), and other trace gases.

The density of air is approximately 1.225 kg/m3 at 20 °C (68°F). Water vapor is the single most important component of dry air, accounting for more than 99% of its mass. The remaining 1% is made up of various other molecules, such as ozone and inert gases such as Argon.

Air is a good conductor of heat. This property allows air to play a role in heat transfer by means of conduction, radiation, and convection.

Conduction: The transmission of heat through a material that melts or changes state upon heating or cooling. For example, when you touch two objects at different temperatures, you transmit heat through the contact point because of conduction.

Radiation: The emission of energy without particles, such as light waves or microwaves.

##### Christopher Whitehurst

Christopher Whitehurst is a nature photographer and naturalist. He has been exploring the outdoors for years and loves to take photos of all kinds of wildlife and scenery. His favorite thing to do is find new and exciting things to photograph, so he never gets bored or tired of what he does.