Activity #1 1. Reset the system and make sure the Constant Parameter button is set to None. 2. Pump 50 heavy gasmolecules and 50 light gasmolecules in the gascontainer. How do the velocities of the heavy gasmolecules compare to those of the light gasmolecules? 3. Use the Heat Control to add energy. Notice that the thermometer shows an increasing temperature. What happens to the velocities of the gasmolecules? 4. Use the Heat Control to remove energy. What happens to the velocities of the gasmolecules?

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.