How much gas...

You can buy magnetic temperature sensing indicators - put one on the cylinder (towards the bottom) when you are using it. During use, the liquid section gets much colder than the gas above it and you can see where the interface is on the indicator by a change in colour.

Or slosh it about - if you can feel/hear the liquid clearly there's quite a bit left in.

Wasn't there something about damping the outside and seeing what level the condesation is at?

You got any digital bathroom scales? put the bottle on the scales and write down the weight in kilo's then deduct the bottles weight which is printed on the bottle. Whatevers left is whats left in the bottle.

Lateral thought.

Keep a spare and not have the problem.

I have a local supplier who will deliver gas and also water softener salt, including taking it from his truck to the places of use at the back of the house.

But even when there's no liquid in it - i.e. when there's still only gas under pressure - it's still got a lot of life in it.

Mary

That's the best plan, and will be done.

Si

Thanks all. Comments and suggestions noted. It does slosh quite well so there must be a fair bit in it yet.

Si

Hmmm... how long does x kg of gas last? Depends on the device using it...

I'll buy a new bottle :-)

Si

My wife collects our gas bottles. By bike.

(13kg propane, in a trailer)

"Clive George" gurgled happily, sounding much like they were saying:

Are you boasting, or offering a delivery service?

Another way of telling that the gas is about to run out is the smell. I used 13kg propane bottles on my houseboat for years and found that for the few days before the gas ran out the cooker would start to smell more strongy of 'gas'.

I suspect this is because the chemical they add to to the gas to make it smell has a higher boiling point than propane so the concentration of it rises as the bottle empties.

Robert

There is no gas if it sloshes, because it's either liquid or vapour.

I used 13kg propane bottles on my houseboat for years and found that for the few days before the gas ran out the cooker would start to smell more strongy of 'gas'.

That's true, I'd forgotten about it.

Mary

Give her a challenge and upgrade to a 47kg bottle.

What? And not leave room for the paper round?

The newer cylinders (Patio Gas) have a guage on them. B&Q do them.

Bring it inside the house overnight then put it outside in the morning. Look for the condensation line as it cools down.

Slatts

What does the guage measure? For liquified gasses there's no pressure change until the liquid all runs out, and at that point you are effectively empty.

OTOH, I don't actually know what patio gas is.

Just a marketing ploy I guess