You pour a bit of boiling water down the side of the cylinder then run your hand down where you poured the water - you will feel a clear delineation in the temperature of the cylinder at the level of the liquid gas inside.
The method described reveals the level of liquid within the container. There is a distinct difference above and below.
How does that tell how much fuel is left?
You pour a bit of boiling water down the side of the cylinder then run your hand down where you poured the water - you will feel a clear delineation in the temperature of the cylinder at the level of the liquid gas inside.
The method described reveals the level of liquid within the container. There is a distinct difference above and below.