which can be done at home using simple or ordinary things
All the power plants, car engines convert heat energy to mechanical energy. When you are driving your motor cycle, the engine of your bike is doing the same.It is burning the fuel to get the heat energy, this energy is being used to move the crank shaft and thus generating rotary motion to the wheels.
Doing it in home can be difficult and also dangerous.One small experiment you can do. Put a kettle in gas burner (with top end closed with lid), heat the water inside the kettle so that steam comes out of the orifice shaped mouth of the kettle. Keep a paper fan at the flow. you will see that fan is moving. This demonstrate with minimum effort that heat energy can be converted into mechanical energy.
As Anthony points out, you can easily convert mechanical energy into heat. But, you are asking about the opposite.
James Watt is often credited with the invention of the steam engine but this is not correct. His contributions to science are many and include significant improvements to steam engines but not their invention. His contributions were so significant that a unit of energy is named after him, the Watt. Your microwave oven is probably rated in Watts. Your utility company probably has multimega-Watt electrical power plants.
One easy way to convert heat into mechanical energy is to put a pot of water on the stove with a lid on it. When the water boils, the steam will lift the lid (doing mechanical work).
There are other ways to do this. You don't have to use water, any gas will expand when heated. A bimetallic strip (often used in simple thermal controls) converts thermal energy into mechanical by bending the bimetal strip, the higher the temperature, the more the bend.
Obviously, the amount of mechanical energy you can create varies depending on how much thermal energy you can produce and how efficiently this can be converted.
yes. steam turbine is the example of that, at home the up and down motion of whistle of pressure cooker is example of that.
look up how a stirling engine works.
tell some easy way out
which can be done at home using simple or ordinary things