Assignment

Assignment-(Pascals principle, Boyles Law, Charles Law)One page 300-500 words per subject, this must be in TUESDAY 3rd MAY

PASCAL'S PRINCIPLE

Blaise Pascal (1623 1662), France - the famous mathematician and physicist, philosopher and essayist. Main contribution is in physics, discovered PASCAL's law, and his name to be used as pressure units.

Pascal's law (the Principle of transmission of fluid-pressure)

Since the liquidity of liquids, when the pressure of a certain part of static fluid changes in a closed container,will pass this pressure to all directions constantly.

According to the Pascal's law, when a pressure went on one of the piston in hydraulic system will produce the same pressure on another piston in the system. If the second piston area is the first ten times of piston area, then the forces on the second pistons will increase to first pistons ten times, but the two pressure of the piston still equal.

P1 = P2, F1 ÷ S1 = F2 ÷ S2

P - Pressure F - Force S - Area

This law in production technology is very important in the application of the principle. It has many uses, such as hydraulic brake etc.

BOYLE'S LAW

Robert Boyle (1627 ~ 1691) physicist and chemist, was born in January 25 1627.

Boyle's law

Certain quality of gas at constant temperature, the pressure in inverse proportion to the volume.

Certain quality of gas, with constant temperature, The average kinetic energy of gas molecules will not change. If gas reduce volume, the number of gas molecules in unit volume will increase, the number of gas molecules hit the container in unit time will increase, so the pressure will increase; if volume increase, the pressure will decrease.

When temperature constant:

P1 x V1 = P2 x V2

P - pressure V - Volume

LARGER PRESSURE - LESS VOLUME

LESS PRESSURE - LARGER VOLUME

CHARLE'S LAW

Jacques Alexandre Cesar Charles (1746～1823）French physicists and mathematicians and inventor.

Charle's law

Describe the pressure of quality gas at constant temperature for linear with its volume change rules: V=V0(1+βt)，V0 is the volume at 0℃, t in Celsius temperature, β is gas coefficient of expansion. For the ideal gas, β=1/273.15, V=V0(1+t/273.15), The quality that shall set the volume of ideal gas pressure with thermodynamics is proportional to the temperature.

Certain quality of gas, when its volume is certain, it is proportional to the pressure and temperature.

When volume constant:

P1 ÷ P2 ＝ T1 ÷ T2 　　

P - pressure T - temperature