If a medical gas cylinder is exposed to a change in temperature, then the pressure within the cylinder will change. The final pressure will depend on the initial pressure and the new temperature.


Starting with the ideal gas law:


P * V = n * R * T



• P = pressure in atmospheres

• V = volume in liters

• n = moles of the gas

• R = universal gas constant 0.08205 liters atmosphere per degree °K per mole

• T = temperature in °K = 273.15 + °C


For a gas cylinder, volume, n and R are constant, while the P and T will vary.


If the ideal gas law is manipulated:


pressure at the new temperature =

= (pressure at initial temperature) * ((new temperature in °C) + 273.15) / ((initial temperature in °C) + 273.15)


The pressure at the new temperature will be in the same units as the initial pressure.

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