PV Gap

Erica Said:

You have a 30 gal tank at 90psi. How long will it take the tank to empty w/ a constant 5psi leak?

We Answered:

need to know what size port you are releasing the air/fluid from? how did you work out you have a 5psi leak?
not enough info

Edith Said:

How calculate PSI/Flow in a Thermosyphon?

We Answered:

The pressure difference in a thermal circulation hot water system is given by (this can be used for any type of hot water boiler fed system without a circulation pump) :

deltaP = h(Dr - Dd) = h(1/Vr - 1/Vd) Where:

deltaP = pressure difference for water circulation in lbs. per sq. ft., and is the pressure available to overcome friction
h = difference in elevation between the heat source and the radiator in feet.
Dr = density of the return water in lbs. per cu. ft.
Dd = density of the delivery water in lbs. per cu. ft.
Vr = specific volume of the return water in cu. ft. per lb.
Vd = specific volume of the delivered water in cu. ft. per lb.
use a table of thermodynamic properties of water and steam to determine Vr & Vd.

To express the deltaP pressure drop in milliinches of water instead of lbs. per sq. ft. use

deltaP = 193h(1/Vr - I/Vd)

Note that you will want a shutoff valve in front of your boiler or heat source, a shutoff valve in front your radiator, an air bleed valve at the high point of the radiator, and a vented expansion tank connected to the boiler water feed line to the radiator, and installed at an elevation higher than than the radiator.

When the water temps are the same you will have no flow.

Denise Said:

If we have the power to reach space safely and easily, why arent we using it?

We Answered:

aren't rail guns and EMP weapons 2 VERY different systems?
http://en.wikipedia.org/wiki/Electromagn…

http://en.wikipedia.org/wiki/Railgun

I'd scratch EMP from your list.

could you imagine how much energy you'd need to maintain a balanced magnetic connection with an object traveling that far.... straight from the surface to the outer reaches of earth's atmosphere? not very particle.

now if this was done in space, all that would be needed would be a burst and the speed will be maintained my natural physics from that point...........

besides, to change directions, you'd have to replace the ship into a new launching machine., each time.......