上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY Temperature © Particles are always moving. © When you heat water,the water molecules move faster. When molecules move faster,the substance gets hotter. © When a substance gets hotter,its temperature goes up.Temperature Particles are always moving. When you heat water, the water molecules move faster. When molecules move faster, the substance gets hotter. When a substance gets hotter, its temperature goes up