At constant temperature, the volume of a confined gas is inversely proportional to the pressure to which it is subjected.
At constant pressure, the volume of a confined gas is directly proportional to the absolute temperature.
A change in pressure at an point in an enclosed fluid at rest is transmitted undiminished to all points in the fluid.
Further explanation
When the gas pressure is kept constant, the gas volume is proportional to the temperature
![\tt (V_1)/(T_1)=(V_2)/(T_2)](https://img.qammunity.org/2021/formulas/engineering/high-school/sluchmc9m9kmw6e4ng5gaz32qyixsdbevq.png)
At a constant temperature, the gas volume is inversely proportional to the pressure applied
![\tt P_1.V_1=P_2.V_2](https://img.qammunity.org/2021/formulas/engineering/high-school/bt98miv5sgof4ofr62owfaw4v62910nz2l.png)
The pressure exerted by the liquid in a closed space is continued in all directions equally
![\tt P_1=P_2\\\\(F_1)/(A_1)=(F_2)/(A_2)](https://img.qammunity.org/2021/formulas/engineering/high-school/5i4quzwntlxdua6hsh8h0uq1oe9yiyaxpi.png)