SHOW AND TELL
•INDEX • • • • • • • •
The expansion of objects What is expansion? What is contraction? Thermomrter works? Heat and transformation of energy. Heat of energy. Electrical current. Transformation of energy
THE EXPANSION OF OBJECTS
• What is expansion? Is the increase of an object when the temperature is raised.
• What is contraction? When the temperature of an object is lowed,its size decreases.
• Thermometer Works? It has a chamber filled with mercury and a very thin tube , when the liquid is warmed its volume expands and rises up into the tube.
HEAT AND TRANSFORMATION OF ENERGY
• Heat of Energy: Energy is transformed from one form to another, some of energy transformed into heat.
• Electrical Current: When an eletcrical current circulates throught a light blub, it lights up,but also gets hot. Some of electrical energy is transformed into light and other is transformed into heat.
• Transformation of Energy: • Chemical energy from a combustible or fuel,such as petrol,is transformed into mechanical energy in the engine.Some of chemical energy is transformed into heat.