You can't let it get in when you are breathing from it, but you can get it into your tank if you don't keep your cap on your tank. Another way is from pressing the button on your second stage, so it can get into your tank.
The best way to keep water from entering your Scuba cylinder is to make sure you keep compressed air inside. Also check your local regulations as to when to have it inspected.
To prevent debris from entering fule system
The numbers on a scuba tank reveal 3 things. Serial no. of the tank. Type metal. and the current hydro date.
aqualung, snorkle, SCUBA tank
You'll either have to hold your breath or have a SCUBA tank.
15 minutes
From a regulator attached to a scuba tank.
The best way to be sure that water does not enter your scuba dive tank when diving, is to never allow it to be completely be emptied of air pressure. Always plan to leave at least 1-2Mpa (10-20 bars) left in them to ensure that moisture does not enter. If for some reason, the scuba dive tank pressure should be completely exhausted, it is important to immediately close the valve to keep moisture out. When bleeding the air from your scuba tank, be sure to bleed the air slowly, as quick bleeding may cause internal condensation.
The empty weight of a 100 cubic foot steel SCUBA tank is approximately 33lbs.
A scuba tank typically holds about 11 liters of air at atmospheric pressure.
Depends on the size of the tank.
Depends on the size of the tank.
I would think so, because there are two of them mixed together. Air in a scuba tank or anywhere else should be heterogeneous. A scuba tank filled with either oxygen or nitrogen would be homogeneous.