There are a number of different types of working models that you could use for a science exhibition. You could demonstrate the flow of water in the water cycle for example by setting up a fountain system.
New energy. Wind turbines. Solar batteries.
Instructions for making a working model will always include what the model is supposed to do in full size. Also needed is the size of the working model.
They will guide us through the exhibition.
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It seems like your question is incomplete. Could you please provide more details about the specific exhibition you're referring to? This will help me give you a more accurate answer.
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To give you the correct amount of freon I would need to know the year, make and model of the vehicle that you are working on....
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Sure, give us the year, make and model.
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