Is Gas considered Mass?

Question

If it is how could you measure it's mass?

Answer 1

yes... gas has mass...

you could measure it like this...

if you know what the gas is... say oxygen...you could estimate it's mass by assuming it's ideal and ...

PV = nRT

n = moles = mass / mw

PV = (mass / mw) RT

mass = PV x mw / RT

if you know pressure, volume and temperature, you can calculate mass.

of if you know density...  density = mass / volume... mass = density x volume

Answer 2

Gas is not mass, but it has mass. Mass is the measure of the amount of matter in any object. Since everything is made up of matter, even gas, then everything mut have a mass, no matter how small or big. Gas is made up of atoms, but there is so much energy in the atoms that they are free to move and can break away from the gravitational attraction of one another. As for measuring the mass of a gas, I am not quite sure of. One possibility though is to measure the mass of a container for the gass, then collect the gas in the container, and then remeasure the mass ( although a very sensetive scale would have to be used, one that can measure up to the millionths of a millligram) and subtract the masss of the containor alone from the mass of the gas filled container.

Answer 3

Gas is a state of matter.

Gasses do have mass.

It can be difficult to directly observe and/or measure the mass of a small amount of gas in a normal air atmosphere, but it can be done in a variety of ways.

Take a compressed air cylinder, for example.

Take the empty cylinder and weight it.  You will get some reading corresponding to the weight (or mass) of the empty cylinder.  Next, fill the cylinder with compressed air; pressurize it.  Now weight the cylinder again.  You will notice that the cylinder has a higher mass.  The difference in the mass of the cylinder (final mass – initial mass) is equal to the mass of the gas which was put into the cylinder as one pressurized it.

Not all gasses have the same molar mass; meaning that if you had X number of particles of gas X and Y number of particles of gas Y, their masses will not necessarily be equal.  The molecules making up the gasses do not all have the same mass.  For example, Helium gas is made up of very light molecules while Carbon Dioxide gas’s molecules are much more massive (a factor of about 11).

You can test this by filling two balloons with equal amounts of two different gasses.  For example, fill 1 balloon with Helium and fill another balloon with an equal amount (volume) of Carbon Dioxide.  Place (and tape down) the balloons on a balance scale.  Since one balloon is more massive than the other balloon, the scale will tilt toward the more massive gas’s balloon.

Actually, Helium is much less dense than air, so the Helium balloon will tend to float away while the Carbon Dioxide balloon will sink in air since CO2 is more dense.  The density of a gas is related to how much mass it has for a given volume.  So if you have equal volumes of different gasses, the more dense gas will weight more than the less dense gas.

EDIT:

It is obvious and easily measured that liquids and solids have mass.  There is also a well-known physical law that mass is conserved…meaning that mass is never created or destroyed (except for a few rare occasions which are beyond the scope of this answer).

So if you started out, for example, with solid water (in the form of an ice cube), then you could weigh it and measure its mass.  Then you could allow that ice cube to melt into liquid water and re-weigh it.  You should measure the same mass.  The heat the water and boil it, thus converting the water into steam (gas).  After all the water bas boiled away into a gas you will have no water left (thus, the mass which remains is zero), so all of that mass which was originally in the ice / water is now contained in the steam (a gas).  Thus, gasses have mass.

Answer 4

yes its measured in whatever unit you want.

Answer 5

Gas consists of molecules of Matter.

Matter has Mass and occupies space.

Weighing a gas is not very practical. As a layman, you'd need scientific tables listing the gases and their Densities.