sp gr and pressure
sp gr and pressure
(OP)
sp gr of a liquid is defined at a certain pressure and certain temperature e.g. 14.7 psia and 60 F.
does this mean at a large height, where the pressure might be 13 psia and the temp somehow maintained at 60 F, that the sp.gr. of the fluid will be different from that at 14.7 psia and 60 F. If at all so, will it be more or less?
Thank you
does this mean at a large height, where the pressure might be 13 psia and the temp somehow maintained at 60 F, that the sp.gr. of the fluid will be different from that at 14.7 psia and 60 F. If at all so, will it be more or less?
Thank you





RE: sp gr and pressure
Temperature is a different kettle of fish, but you asked about pressure.
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: sp gr and pressure
RE: sp gr and pressure
RE: sp gr and pressure
For fluids that are liquid at atmospheric pressure and ambient temperatures, I've looked at the bulk modulus for a bunch of them (when I was trying to find a hydraulic fluid for a pump that operated above 10,000 psig) and couldn't find any that were less than 100,000 psi. There are probably some, but I haven't come across them. At 100,000 psi to reduce volume 1%, 1.5 psi can be neglected.
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat
RE: sp gr and pressure
RE: sp gr and pressure
Pressure IS 1/3 of the three critical parts in the trio of pressure, temperature, AND salinity in determining the density of water in the oceans as it varies from a few feet down (near the surface) to 33,000 feet in the trenches, or from near-fresh water (right under the ice caps) down to the higher pressure and different salinity at the depths at the Arctic or Antarctic.
RE: sp gr and pressure
At large heights the gravity force will be reduced.
But I suppose you are not really considering great heights.