How can I calculate the volume of liquid gas in my cylinder?

[jpgoncal]

Hi all

I would like to know how to calculate the volume of liquid gas (CO2)
inside a cylinder of 50L.

Its for a medical centrifuge machine and
we will have problems with high G's that will move the liquid to the sides...
(and could block the valve)

Any formulas help? (i don't have any background in chemics - gases).

TKS

 

[wxrocks]

Most of the CO2 would be liquid (@ room temp) once it is put under pressure. Your cylinder should tell you how much CO2 (by weight) you should put in your cylinder. If you assume say 90-95% of it being liquid, I think you'd be safe.

I am wondering what you mean by "blocking the valve." The valve should be able to slow the liquid as well, and the liquid will just turn to gas as it escapes. If you are concerned about getting the contents out of the tank, just get one with a siphon tube so that most of the liquid comes out.

 

[ravenprp]

To calculate the volume of liquid gas in your cylinder, you will need to know the density of the gas and the pressure inside the cylinder. The formula for calculating the volume of a gas is V = nRT/P, where V is the volume, n is the number of moles, R is the gas constant, T is the temperature in Kelvin, and P is the pressure.

First, you will need to determine the number of moles of CO2 gas in your cylinder. This can be calculated using the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin. You can find the value for R and convert the temperature from Celsius to Kelvin.

Next, you will need to determine the density of CO2 gas at the given pressure and temperature. This can be found using a gas density calculator or by looking up the density in a gas table.

Once you have the density, you can use the formula V = nRT/P to calculate the volume of liquid gas in your cylinder. Keep in mind that as the gas is compressed, the volume will decrease, so you will need to monitor the pressure and temperature in your cylinder to get an accurate measurement.

It is also important to make sure that your centrifuge machine is designed to handle high G-forces and has proper safety measures in place to prevent any potential accidents. If you are unsure about the calculations or handling of the gas, it would be best to consult a professional with a background in chemistry or gas handling.