I need help to answer me these :
1) What will happen when the gas is used instead of liquid in hydraulic system? Will the pressure be transmitted throughout?
I don't really understand the transmission of pressure. When the pressure can be transmitted equally throughout, why is the pressure in the mecury column of barometre varies with height?
2)The height of mercury column in barometre is lower than 76mm.The possiblities are
-some air is trapped inside the tube
-The temperature of the sorrounding is high
I think both of them are possible.
1) What will happen when the gas is used instead of liquid in hydraulic system? Will the pressure be transmitted throughout?
Liquid is incompressible. Gas is compressible.
Hence, when gas is used, the full force/pressure/energy will not be transmitted to the other side of the hydraulic system.
I don't really understand the transmission of pressure. When the pressure can be transmitted equally throughout, why is the pressure in the mecury column of barometre varies with height?
In barometers, we are not talking about transmission of pressure. It's unlike a hydraulic system; it's two different systems altogether.
2)The height of mercury column in barometre is lower than 76mm.The possiblities are
-some air is trapped inside the tube
-The temperature of the sorrounding is high
I think both of them are possible.
Some air trapped is possible.
Temperature of surroundings higher, it would affect the density. But air pressure is due to air from sea level all the way to the end of the atmosphere, it's kilometres of air. So by right, just the temperature of the surroundings alone would not be sufficient to affect the atmospheric pressure too much.