The so-called "20 lb propane bottle" is, I believe, a rather 'nominal'
I'm looking for some rather exact figures. How many gallons of
propane does this 20 lb bottle hold? How much does propane weigh per
I've seen these _EXACT_ figures posted where I get my bottles
filled, but I cannot go to that place within next week or so........
Thank you.... Lee Carkenord
Are you looking for what the volume of the container is?
or what the volume of the propane would be in open air?
'cause the amount of space that the propane takes up
is exactly equal to the volume of the bottle, no matter
how much propane in in there.
But anyway: The Molar weight of Propane is 44.1 grams per mole.
Thus, one mole of propane weight 44.1 grams, and occupies 22.4 liters at
20 pounds is a bit over 9000 grams, and therefore 203190 liters, or 53621
Again, at STP. At room temperature, instead of freezing, that would be
10% bigger. But I would have expected propane to be measured in
cubic feet, not gallons, and that figure should be roughly 7100+ cf.
Your ability to do math is impressive, but you did not answer the real
question. How much propane is in a 20 pound thank so he can figure the cost
or how long it will last. 7100 cubic feet is a rather big tank to have for
a grill don't you think?
Holy Cow - 53.6 thousand gallons That's an impressive number when you
pause to think about helium balloons that look to be about a one gallon
size. What's the molar weight of Helium, # per liter?
Wonder how many gallons is in the standard bernzomatic.
The specifuc gravity of propane is 0.585. Multiply that times 8.33 (weight
of one gallon of water) and you get 4.87305 pounds as the weight of a gallon
of propane. Divide that into 20 and you get 4.1+ gallons.
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Propane has 91,044 Btu per gallon liquid.
OTOH, the 20 pound figure is the weight of the empty tank, not the amountof
gas in the tank. IIRC, that is about 16 pounds, but I don't know for fact.
Here is some information:
Next time I get a fill up, I'll have to watch the scale and see for myself.
the specific gravity of propane is 0.509 & 4.24 pounds per gallon.
Gives 4.717 gallons for 20 pounds.
I think those tanks could hold more than 5 gallons, but as I remember, by
law they were not supposed to be fille more than to 80% of capacity. The
new valves assure that.
The tank weighs right about 17 pounds. I weighed a full tank a while ago
and I think it was about 37 pounds.
No. You no longer get 20 pounds. If you have it filled they usually charge
you by the weight or number of gallons that are actually put in the tank.
Before the new safety valve some would fill the tank too full. I have had
some that started blowing off gas through the safety valve when they started
to get warm.
I have two of them on my trailer and the difference in how long they last is
Several sites about it:
Of course if you take a partly filled bottle to one of those places where
you exchange for another bottle you will be paying extra.
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