Gases : Laws 
Boyle's Law
Temperature (T) and moles of gas (n). 

Robert Boyle 

Amonton's Law
Charles' Law
at constant P and n. 

JacquesAlexandre
César Charles 


GayLussac's Law(law of combining volumes)
equal to the ratio of simple whole numbers (coefficients in the balanced equation).


Joseph Louis
GayLussac 
Avogadro's Hypothesis
and pressure contain the same number of particles. 

Amadeo Avogadro 
Dalton's Law of Partial Pressures
Next: "Ideal Gas Equation"