Through these experiments, you concluded that:

1. The volume and density of air change with temperature changes. According to Charles Law, as the temperature of air increases, its volume increases and its density decreases. As the temperature of air decreases, its volume decreases, and its density increases.

2. As air is heated its density decreases because its mass remains constant but its volume increases. As air is cooled, its density increases because its mass remains constant but its volume decreases.

3. Air is a fluid. Fluids that are more dense sink below those that are less dense. The decrease in density as air is heated causes it to rise above cooler, more dense air. The increase in density as air is cooled causes it to sink below warmer, less dense air.

4. The warmer air in the atmosphere rises and cooler air in the atmosphere sinks. This causes convection currents in the atmosphere.