Ch. 14 - Gases II. The Gas Laws P V T

Robert Boyle (1627-1691) Boyle was born into an aristocratic Irish family Became interested in medicine and the new science of Galileo and studied chemistry.  A founder and an influential fellow of the Royal Society of London Wrote extensively on science, philosophy, and theology.

A. Boyle’s Law P V PV = k

A. Boyle’s Law The pressure and volume of a gas are inversely related at constant mass & temp P V PV = k

A. Boyle’s Law

Jacques Charles (1746-1823) This is how his interest in gases started Part of a scientific balloon flight in 1783 –one of three passengers in the second balloon ascension that carried humans This is how his interest in gases started It was a hydrogen filled balloon!

B. Charles’ Law V T

B. Charles’ Law The volume and absolute temperature (K) of a gas are directly related at constant mass & pressure V T

B. Charles’ Law

Joseph Louis Gay-Lussac (1778 – 1850) French chemist and physicist Known for his studies on the physical properties of gases. In 1804 he made balloon ascensions to study magnetic forces and to observe the composition and temperature of the air at different altitudes.

C. Gay-Lussac’s Law P T

C. Gay-Lussac’s Law The pressure and absolute temperature (K) of a gas are directly related at constant mass & volume P T

PV T V T P T PV = k P1V1 T1 = P2V2 T2 P1V1T2 = P2V2T1 D. Combined Gas Law PV T V T P T PV = k P1V1 T1 = P2V2 T2 P1V1T2 = P2V2T1