Might want to check your basic chemistry again. All gases expand and contract to some degree with changes in temperature including Nitrogen. Nitrogen is generally used since it won't generally contaminate the system or cause corrosion or other problems.
The ideal gas law basically states:
where P is pressure, V is volume, n is the number of moles, T is the temperature in degrees Kelvin, and r is the universal gas constant. If the temperature changes, the volume will either increase or the pressure will.
Nitrogen is a Group 15 element. The element seemed so inert that Lavoisier named it azote, meaning "without life". Nitrogen gas is colourless, odourless, and generally inert. As a liquid it is also colourless and odourless. Prof. James Marshall U of North Texas
Nitrogen is the recommended gas for leak testing, purging, and brazing In the HVAC & R industry.
Air, freon, water, propane, oil, and so on and so on will react to changes in temp. My point is that nitrogen will not and makes a better gas to check for leaks.
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