1) The document discusses Boyle's law, which states that the pressure and volume of a gas are inversely proportional at a constant temperature. 2) It provides a table showing the inverse relationship between the volume and pressure of a trapped gas as the pressure increases from 1 to 6 units and the volume decreases. 3) The proportionality constant (k) is equal to the product of pressure (P) and volume (V), such that P1V1 = P2V2.