Pascal 's Principle fluid , such as water . incompressible you've got some Suppose applied to the enclosed in a container . Any change in pressure throughout the fluid and to the walls fluid will be transmitted of the container . This change in pressure is not diminished even over large volumes . This is Pascal 's principle . Example 1 : You squeeze a tube of toothpaste . The pressure of does not just go up at the place where you are the toothpaste in the squeezing it . It goes up by the same amount everywhere tube Example 2 : If someone is choking and you do the Heimlich maneuver , you apply a force to his abdomen . The increase in transmitted to his throat and dislodges the food on pressure is which he was choking .