HELP req'd with Physics/maths type question!
12 February 2003, 07:30 PM
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I'm basing it on "megacalc" off my PDA, converting 3 kgf/cm2 to the other units. If it should be 3 kgf/mm2, that would be 3000 meters of pure water. I'll just do a couple of quick calcs in case it is a bug in the programme . . . .
Edit to correct typo. Also makes alcazar's post below look silly
[Edited by hades - 12/2/2003 7:37:19 PM]
Edit to correct typo. Also makes alcazar's post below look silly
[Edited by hades - 12/2/2003 7:37:19 PM]
02 December 2003, 07:08 PM
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If a watch is waterproof to 200 meters, this equates to 20 ATM(atmospheres), or 20 bar. And 1000 meters, 100 ATM, 100 bar..etc.
Now then, how many meters, ATM, and bar is a watch labeled......
waterproof to 3KGs/CM2, which is 3 kilogrammes per centimeter squared?
Thanks in advance.
Yoza
Now then, how many meters, ATM, and bar is a watch labeled......
waterproof to 3KGs/CM2, which is 3 kilogrammes per centimeter squared?
Thanks in advance.
Yoza
02 December 2003, 07:19 PM
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Well, I make it 2.94bar, 29.23 meters (seawater) or 30.00 metres of pure water. Care for the value in any other units?
02 December 2003, 07:27 PM
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Are you sure?I hope you are wrong.
The reason I am in doubt is that this is a Military Deep Sea Divers watch.
Could you have missed a few naughts out.....?
I was guessing at 5000 meters, or more.
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02 December 2003, 07:36 PM
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Assuming 1 kg = 2.2lbs, 2.54cm = 1 inch, 14.5psi = 1 bar (all off the top of my head, but will be close)
3 kg / cm2 = 6.6 lb / cm2 = 42.6 lb / in2 (psi)
42.6/14.5 = 2.94bar.
Therefore, I'd say the numbers I quoted are correct, and my PDA isn't lying.
If it's for deep sea use, I suspect it's 3 kg / mm2 i.e. 2922 meters seawater. That's pretty serious depth, not many people swimming around in a normal wetsuit and scuba kit almost 2 miles below the surface!
3 kg / cm2 = 6.6 lb / cm2 = 42.6 lb / in2 (psi)
42.6/14.5 = 2.94bar.
Therefore, I'd say the numbers I quoted are correct, and my PDA isn't lying.
If it's for deep sea use, I suspect it's 3 kg / mm2 i.e. 2922 meters seawater. That's pretty serious depth, not many people swimming around in a normal wetsuit and scuba kit almost 2 miles below the surface!
02 December 2003, 07:38 PM
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This is exactly what it says on the guarentee........
"The case provides water integrity to the movement with water pressure no more than 3KG/cm2 at a pressence under water at said pressure, of no more than 1 hour".
Cheers
"The case provides water integrity to the movement with water pressure no more than 3KG/cm2 at a pressence under water at said pressure, of no more than 1 hour".
Cheers
02 December 2003, 08:01 PM
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These modern power showers do manage serious pressures. I'm sure I saw one the other day rated at 100000 psi. 
Come to think of it, it may have been labelled "water jet cutter" - That's a real man's power shower, rather than one of these wussy £200 from B&Q things.
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