How much does air weigh in grams?

Answer 1

About one gramNot to be a smart-ass, but one gram is one gram. Although the gram is a unit of mass, not weight, we often weigh things on a scale and then say it weighs x grams or kilograms.

How confusing can you get?!

We do that because most experiments take place here on Earth, not the moon or Jupiter, where things weigh considerably less or more, respectively, than on Earth. Weighing something is the easiest way -- no pun intended -- to determine an object's mass.

So, the real answer to your question is not a statement but another question: On what planet? See, on Earth, one gram of air weighs one gram. But on Jupiter, a gram (mass) of air weighs considerably more, as do all things.

Now, if your question is What is the weight of one gram of air in ounces, well, that's another kettle of fish. And I have no idea how much a kettle of fish weighs. But one gram -- of anything -- is 0.0352739619 ounces.

By the way -- again, no pun intended -- many people use the Newton as the unit of weight, because the Newton is the SI unit of force, and weight is a special kind of force.

...Actually, if you took 1 gram worth of air, it would be about 3/4 of a liter. If you took a plastic bag, weighed it empty, then filled it with 3/4 of a liter of air and weighed it, then subtract the weight of the empty bag:

YOU SHOULD GET ZERO!

Why?

The air inside the bag is being held up by the buoyant force of the air outside the bag. They balance each other out.

If you had helium in the bag, the bag would obviously weigh less than empty and if you had water in the bag, it would obviously weigh more, but you may not know that there is a difference in the weight (force of the earth pulling down on the bag) because of the atmosphere surrounding the bag.

Answer 2

The weight of 1 liter of air depends on the composition of the air, the temperature, the pressure, and the gravitational field it is subject to.

As an example, let us assume air of composition:

79 mole% N2 (nitrogen)

20 mole% O2 (oxygen)

1 mole % Ar (argon)

This would give an average molecular weight of

0.79x28.01335 + 0.20x31.9988 + 0.01x39.948 = 28.930 or 28.930 g/mole

At 0 °C and 1 bar pressure 1 mole of gas occupies 22.4 liters, i.e. 22.4 liters/mole

hence we have 28.930/22.4 = 1.29 g/liter

At normal earth gravity this would weigh 0.0127 N (Newtons) or 0.00285 lbf or 0.0456 ounces.

Answer 3

I don't want to confuse you, but we never actually talk about a pound of air, even though

we do use those words. When you hear somebody say "pounds of air" ... like in the

tires on his car ... it almost always means "pounds per square inch", and that's pressure.

On or near the surface of the Earth, there are about 453.6 grams of anything in a

pound of it.

And another thing:

Air certainly does have weight. Don't let anybody tell you that it doesn't.

If you draw a little square in the dirt on the ground, 1 inch by 1 inch, then the weight

of all the air sitting on that little square, from the ground all the way up to space where

there isn't any more air, is around 14 pounds.

Answer 4

10 pounds

3-4 oz.

Answer 5

a cubic foot of air weighs 7 grams