Blaise Pascal
Blaise Pascal was one the leading scientists of the seventeenth century. Educated by his father, Pascal invented the Pascaline, one of the first mechanical calculators ever. He was an early proponent of the theory of vacuums. Though he died young, at the age of 39 after sudden illness, he left a lasting legacy to science with Pascal's Law, which dealt with pressure and fluid.
Pascal's Law
In essence, Pascal's Law maintains that if you have a container filled with fluid and you apply pressure to that container, the pressure will be distributed equally throughout the fluid in that container no matter where the pressure is applied, so long as the container is closed, the fluid is static and no other intervening forces are operating on the fluid.
Flow
We can all picture water flowing, or imagine how flowing air feels against our faces. But the term "flow" has a specific scientific meaning. It refers to the amount of gas or liquid that passes by a certain point during a certain period of time. The scientific formula for flow is F=Q/t, or flow equals the quantity of fluid divided by the amount of time that has passed.
Laminar Flow and Pascal's Law
Laminar flow is the flow of a fluid in layers, where each of the layers are moving at the same speed and at the same velocity. Laminar flow often occurs in fluids with high viscosity---that is, thick fluids. And Pascal's Law applies to laminar flow in that any pressure applied to a container of fluid will be equally distributed throughout that container, so as to help maintain laminar flow. Imagine if you were to squeeze a tube of toothpaste. The pressure of the squeeze is evenly distributed to all the toothpaste molecules according to Pascal's Law, and so helps maintain the laminar flow of that toothpaste---that is, the movement at equal speed and velocity of the layers of toothpaste out of the tube.