Gas behavior refers to how gases respond to changes in temperature, pressure, and volume. According to Boyle's Law, when the pressure of a gas increases, its volume decreases, provided the temperature remains constant. Conversely, Charles's Law states that if the temperature of a gas increases, its volume also increases, assuming pressure is constant. These principles illustrate that gases expand to fill their containers and can be compressed. The Ideal Gas Law combines these relationships into a single equation, showing how the pressure, volume, temperature, and amount of gas are interrelated. Understanding gas behavior is essential in fields like chemistry and engineering.