Rosch taking orders on OU Bouyancy device.

[Pirate88179]

And since 9/11 there have been hundreds of terrorist attacks.  And since 9/11 there have been hundreds and hundreds of terrorist plots thwarted.  It's a trade-off between increased government surveillance and going to the evil Capitalist secular shopping mall and having to worry about being blown up, gunned down, or stabbed to death.

You know how the police have to pull up security footage from local businesses when they do an investigation?  We are not far away from the day where all major commercial streets and public places in the entire country are covered by a cohesive network of police cameras.  Skynet for real.  It sucks but what are you really going to do?  The 'enemy' is not only the bad guys already mentioned, the enemy is ourselves and the human condition.

We have seen the enemy, and it is us.

Bill

[tinman]

When I put that into my calculator I get 2096...
= -0.9 * 8.313 * 280.15 * 3

vs what I said
= 0.84 * 8.3145 * 291.3 * -3   (-2031)

ln(x/y)=-ln(y/x) so +/- ... as appropriate

your moles are higher, but tempurature lower... so it should still be at least in the same ballpark....

Your answer dose seem more plausible d3x0r,as 6.35kW seems a lot just to fill a 1ltr vessel to 290psi. I will have to check that out with my watt meter and high pressure compressor. Only problem is,the tank is 5ltr's. Is it just a matter of dividing the result in watts by 5?.

Im finding it hard to believe that LE would get this wrong.

[d3x0r]

Your answer dose seem more plausible d3x0r,as 6.35kW seems a lot just to fill a 1ltr vessel to 290psi. I will have to check that out with my watt meter and high pressure compressor. Only problem is,the tank is 5ltr's. Is it just a matter of dividing the result in watts by 5?.

Im finding it hard to believe that LE would get this wrong.

I did his own math! 
he's got an extra *3 between that he used for nRT... and what he said for the answer.
It's his numbers that get the same number as me.

-----------
if it's 5L instead it's still 100L source and it's still 20:1 in that...
so it's 5x the energy storage. (J)

[LibreEnergia]

Your answer dose seem more plausible d3x0r,as 6.35kW seems a lot just to fill a 1ltr vessel to 290psi. I will have to check that out with my watt meter and high pressure compressor. Only problem is,the tank is 5ltr's. Is it just a matter of dividing the result in watts by 5?.

Im finding it hard to believe that LE would get this wrong.

I'm not sure what kind of calculator he is using but I calculate it the same as before. As a sanity check using mental arithmetic lets say it was 1 mol,  the gas constant is 8 and the natural log of (1/20) is 3 and the temperature is 280 K.  then Joules required =  1 * 3 * 8 * 280 =  6720. I'm not sure how he calculates something near a third of that.

Also the result is in Joules. A joule is a measure of energy not power.  If you were using a 10 kW compressor at 65 % efficiency you'd compress that 20 litre volume down to 1 litre  in approx. 1 second.  A 5 kw compressor would take 2 seconds etc..

[d3x0r]

I'm not sure what kind of calculator he is using but I calculate it the same as before. As a sanity check using mental arithmetic lets say it was 1 mol,  the gas constant is 8 and the natural log of (1/20) is 3 and the temperature is 280 K.  then Joules required =  1 * 3 * 8 * 280 =  6720. I'm not sure how he calculates something near a third of that.

Also the result is in Joules. A joule is a measure of energy not power.  If you were using a 10 kW compressor at 65 % efficiency you'd compress that 20 litre volume down to 1 litre  in approx. 1 second.  A 5 kw compressor would take 2 seconds etc..

crazy I ran that 3 times before and got the 2k answer...
but ya it's 6.7k...

--------
I see... using -3...
0.84 * 8.3145 * 291.3 * -3
the operator at the end becomes - instead of *