ANSWER
In the case of polythene, gauge can be converted to thickness by dividing by four to get the thickness in micron or dividing by 4000 to get the thickness in mm. Here are some common examples:
100 gauge = 25 micron = 0.025mm
120 gauge = 30 micron = 0.03mm
200 gauge = 50 micron = 0.05mm
250 gauge = 62.5 micron = 0.0625mm
400 gauge = 100 micron = 0.1mm
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A paint thickness gauge will allow you to find out the thickness of the paint you are using. This means that when this is necessary for particular tasks that you have a good tool to help you.
It refers to the strength and wall thickness of the pipe.
The word aneroid means "without fluid".
really thick really thick! That's a really thick answer. What people need to know is that 22 refers to Standard sheet and Wire Gauge. See: http://www.mig-welding.co.uk/forum/showthread.php?t=4143 Far from being thick it is rather thin especially if you want to weld it. It is 0.7mm
Nominal, in this context, refers to the "face value". So in this case it means what the gauge "face" is indicating. Also called gauge pressure. The difference between nominal pressure and actual pressure depends on whether gauge is a calibrated instrument and is indicating the actual pressure.Nominal pressure means rated pressure, that is a nominal pressure rating applied to vehicle parts.Scroll down to related links and look at "Definition of nominal pressure".