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What did hydrogen used to be used for?
The only answer that comes to mind is "Airships". Hydrogen, the lightest element, was used in airships, where excess weight was undesirable. However, accidents like the Hindenburg disaster showed...
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How can this be used?
It's very easy: just ask a question and, hopefully, it will soon be answered
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Why is a model airplane used and where it is used?
A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)
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What is used for fungi used on pizzas?
Porcini, baby portabello, and regular white mushrooms are common pizza toppings.
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Where is democracy used Where is monarchy used Where is republic used Where is oligarchy used?
Democracy is used in America and some other countries Monarchy is used in China, England and other countries