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Old 29 October 2007, 04:31   #11
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Huh???
I think the second one was meant to say "petrol" not "water"!
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[Edit - I should point out I couldn't be bothered looking up the density of petrol so it has been done from a vague memory - but I am sure it will be roughly right]
A quick search turned up a handy list of specific gravities

At 0.74 Kg/l the 25 litres of petrol is going to weigh 18.5 Kg so the difference is actually a bit more.

John
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Old 29 October 2007, 04:57   #12
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I think the second one was meant to say "petrol" not "water"!
A quick search turned up a handy list of specific gravities

At 0.74 Kg/l the 25 litres of petrol is going to weigh 18.5 Kg so the difference is actually a bit more.

John
Thats a surprisingly large difference, no wonder it was noticeable .. ta
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Old 29 October 2007, 05:47   #13
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Originally Posted by John Kennett View Post
I think the second one was meant to say "petrol" not "water"!
A quick search turned up a handy list of specific gravities

At 0.74 Kg/l the 25 litres of petrol is going to weigh 18.5 Kg so the difference is actually a bit more.

John
Ah yes sorry - thanks for spotting that . Must have been the extra vapour pressure from the full 25L fuel tank in the back garden !
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Old 29 October 2007, 06:44   #14
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A quick search turned up a handy list of specific gravities
Interesting site that, I always thought uranium and tungsten were very heavy, (compared to something obvious like lead), but I see a cubic metre of gold is just as dense as both of them
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Old 29 October 2007, 10:05   #15
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This sounds as I'd expected, I'll draft an illuminating letter to S-bury's elf and saiftee manager. I'm happy with sensible regs but enforcing daftness whilst not paying heed to what should be is nuts.

Petrol has been used as a non compressible source of bouyancy in early submersible craft, usually accompanied by a large weight to shed prior to leaving the sea bed.
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Old 29 October 2007, 11:02   #16
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Interesting site that, I always thought uranium and tungsten were very heavy, (compared to something obvious like lead), but I see a cubic metre of gold is just as dense as both of them
I see they don't have the heaviest of them all listed - Osmium - they have Iridium though which is very close - 22,154 compared to lead at just over 11,000.

Interesting to note some of the metal prices these days

US $ per troy oz

Gold 787
Platinum 1456
Osmium 380
Iridium 425
Rhodium 6225

It's amazing to think many people own some rhodium - in the catalyst on their cars!!!

I can't believe the price on gold - it was about 300$ an ounce when they sold off Britain's reserves..........
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Old 29 October 2007, 11:08   #17
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Well that settles it then - I'm packing in the day job and I'm going to dig up all the speed bumps and junctions in Leicester with a mini excavator.

Later when I'm out on the town I'll clearly impress all the totty for miles around with my new job Rhodium miner!!
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Old 29 October 2007, 12:58   #18
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This sounds as I'd expected, I'll draft an illuminating letter to S-bury's elf and saiftee manager. I'm happy with sensible regs but enforcing daftness whilst not paying heed to what should be is nuts.

Petrol has been used as a non compressible source of bouyancy in early submersible craft, usually accompanied by a large weight to shed prior to leaving the sea bed.
Simon - the downside he will just tighten up on the not selling more than the set quantities in the petroleum spirit regulations. Her reasoning was wrong - but the reality is she is not supposed to sell you 40L of petrol in cans...
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Old 29 October 2007, 15:03   #19
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Very true - the law doees say no more than 10L may be dispensed into a portable container in one go - so what you have to do is 1/2 fill it - then go and pay - then go back and stick in the other 10L - bonkers or what???
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Old 29 October 2007, 16:17   #20
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Very true - the law doees say no more than 10L may be dispensed into a portable container in one go - so what you have to do is 1/2 fill it - then go and pay - then go back and stick in the other 10L - bonkers or what???
Actually cod - I think the law says you can't fill a portable container which is larger than 10L (5 L for plastic). And that you can only put 2 of either type type of container in a road vehicle. Technically, as I understand it, 20L jerry cans are illegal to fill at the petrol station.
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