Keisha finds instructions for a demonstration on gas laws. 1. place a small marshmallow in a large plastic syringe. 2. cap the syringe tightly. 3. pull the plunger back to double the volume of gas in the syringe. which best describes the purpose and outcome of the demonstration? this is a demonstration of charles’s law. as the volume increases, the temperature decreases, and the marshmallow will freeze. this is a demonstration of charles’s law. as the volume increases, the temperature increases, and the marshmallow will melt. this is a demonstration of boyle’s law. as the volume increases, the pressure decreases, and the marshmallow will grow larger. this is a demonstration of boyle’s law. as the volume increases, the pressure increases, and the marshmallow will shrink.