Termodinamikaning birinchi qonuni. Ichki energiya. Gazning bajargan ishi

	https://phet.colorado.edu/en/simulation/legacy/balloons-and-buoyancy	Topics Gas Buoyancy Description Experiment with a helium balloon, a hot air balloon, or a rigid sphere filled with different gases. Discover what makes some balloons float and others sink.
	https://phet.colorado.edu/en/simulation/legacy/reactions-and-rates	Topics Reaction Kinematics Concentration Equilibrium Description Explore what makes a reaction happen by colliding atoms and molecules. Design experiments with different reactions, concentrations, and temperatures. When are reactions reversible? What affects the rate of a reaction?