LPG bottles is there a Gage to visually show content remaining . area of location west australia?

Answer 1

The above answers are both correct. The vapor space above the liquid will be at a temperature somewhat different from that of the liquid.

A pressure gage will not be a good indicator. The pressure will remain almost constant until all the liquid has been used. This is because what is being read is the vapor pressure of the liquid. This is constant at a given temperature, regardless of whether the tank is full, or less than full.

This is different, of course from a pressure gage on an automobile tire, because this is a gas pressure, rather than a vapor pressure.

Answer 2

In Canada there is a tape thermometer that sticks to the side of the tank and shows a different colour at the current gas level. It's available at local hardware stores here in Canada or you can park it on a scale and watch it get lighter.

Answer 3

You can purchase an "aftermarket" gauge that you simply stick to the outside of the tank, and it will show you the approximate level of LPG in the tank. It is temperature sensitive, and reacts to the lower temperature of the liquified gas.