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halothane : red
Black
2,000 psig
There is no universally recognized color code for gas cylinders. You should always read the label rather than relying on the cylinder color. In Europe, the standard is for nitrogen cylinders to have a black shoulder, but it's still safest to read the label.
Using a pressure guage to determine the pressure of the gas inside, as thepressure decreases you can tell that it is getting empty. Another way is if you know the weight of the empty cylinder weigh the cyleinder and the difference gives you how much nitrogen is in it.
halothane : red
black colour
Grey with black head
nitrous oxide cylinders are blue
colour of solar cooker
At the level of individual atoms, no atom has color.
Nitrogen slowly leaks out
Black
red
...whatever pressure it was filled to...
2,000 psig
Nitrogen is a colorless, odorless, and tasteless nontoxic gas.