This came up recently at another forum and I thought some may like the idea.
A guy asked if there was a gauge to measure the remaining fuel inside a gas canister. So I posted a link to the Brunton branded ones.
Trouble is ,they are not very accurate ( because they work on temperature differences, temperature makes the difference...)
A way to find out what is left whilst on the trail is to use Archimedes's principle. So what you do is immerse n empty canister in water, make a mark at the water level. Do the same with a full one. From that you can work out half,a quarter , whatever. So before you start the trip mark your cartridge at the same points and do the immersion test when needed.
Of course at home you just weigh the cartridge and subtract the tare weight from the gross weight.
Franco
(This has provably been discussed before.. but just in case)
Gas canister gauge
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TIP: The online Bushwalk Inventory System can help bushwalkers with a variety of bushwalk planning tasks, including: Manage which items they take bushwalking so that they do not forget anything they might need, plan meals for their walks, and automatically compile food/fuel shopping lists (lists of consumables) required to make and cook the meals for each walk. It is particularly useful for planning for groups who share food or other items, but is also useful for individual walkers.
TIP: The online Bushwalk Inventory System can help bushwalkers with a variety of bushwalk planning tasks, including: Manage which items they take bushwalking so that they do not forget anything they might need, plan meals for their walks, and automatically compile food/fuel shopping lists (lists of consumables) required to make and cook the meals for each walk. It is particularly useful for planning for groups who share food or other items, but is also useful for individual walkers.
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Gas canister gauge
by Franco » Sat 21 Nov, 2009 12:14 pm
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Re: Gas canister gauge
by Son of a Beach » Sat 21 Nov, 2009 12:27 pm
That's a good tip. A very simple principle but effective and useful. Thanks! 
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Re: Gas canister gauge
by Ent » Tue 24 Nov, 2009 9:37 am
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Last edited by Ent on Tue 16 Nov, 2010 3:34 pm, edited 1 time in total.
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Re: Gas canister gauge
by Son of a Beach » Mon 14 Dec, 2009 3:54 pm
I've just marked the full water level on the outside of two large Kovea gas cannisters that somebody gave me as a late birthday present. It's worth noting that you need to jiggle the canister in the water (or completely submerge and invert it) in order to get the air out of the concave space at the bottom of the cannister. Also the (large) cannister doesn't float upright in water so you have to try to hold it in place without putting weight on it. I might try doing it upside down next time to see if it will sit in the water better that way.
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