The gas in the piston is at constant temperature. A student increases the pressure on the piston from 2 atm to 3 atm. The observation will be summarized in a row of the incomplete table below.
mc026-1.jpg

Row Name Observation Constants
1 Boyle's law ? ?
2 Charles’s law ? ?
3 Gay-Lussac’s law ? Volume, moles of gas
4 Combined gas law ? ?

Which row of the table and which observation would the student fill?
row 1, volume decreases when temperature decreases
row 1, volume decreases when pressure increases
row 3, volume decreases when temperature decreases
row 3, volume decreases when pressure increases