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post #31 of 35 Old 10-12-2007
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Nitrogen is not a noble gas, and as such is not inert. However, it is far less active than most other common gases.
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In English, to be inert is to be in a state of doing little or nothing.

In chemistry, the term inert is used to describe something that is not chemically active. The noble gases were described as being inert because they did not react with the other elements or themselves. It is now understood that the reason that inert gases are completely inert to basic chemical reactions (such as combustion, for example), is because their outer valence shell is completely filled with electrons. With a filled outer valence shell, an inert atom is not easily able to acquire or lose an electron, and is therefore not able to participate in any chemical reactions. For inert atoms or molecules, a lot of energy is involved before it can combine with other elements to form compounds. A high temperature and pressure is necessary, and sometimes requires the presence of a catalyst. Wikipedia

Nitrogen is an inert gas and is not chemically active.

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post #32 of 35 Old 10-12-2007
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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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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:

PV=nRT

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.

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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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post #34 of 35 Old 10-15-2007
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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.
All matter reacts to changes in temp.

Like SD said (PVT), If the temp increases, and the gas is stored in a sealed container, the pressure will change. The ideal gas law works for all gases, nitrogen included.

Nitrogen is mostly inert (not fully inert), and is used so frequently because it is so widely available (78% of the atmosphere by volume).

Dictated, but not read.

Last edited by Sapperwhite; 10-15-2007 at 06:58 PM.
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post #35 of 35 Old 10-18-2007
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"Nitrogen is an inert gas and is not chemically active."

"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."

Should have read that nitrogen is considered an inert gas and is not considered chemically active.

My second statement should have read that considered dry,nitrogen will not contract and expand as great to changes in temperature and makes a better gas to check for leaks.

In context of the original question, I considered original statements correct. I was relating nitrogen to the other gases available to a DIY (compressed air, propane, ands so forth). Outside of the question and I can see where my statements may have seemed slightly bold and partially incorrect and have adjusted accordingly.

If there is something better for pressurizing and leak testing piping that is easily accessible, please let me know.


Sorry about being so late to respond, reality is getting in the way of my fantasy.
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