1. Chemistry helps firefighters O determine which chemicals to use to fight different types of fires
O calculate how much water pressure is available at a hydrant
O know the angles at which they can safely deploy ladders
O identify the temperatures at which different substances burn

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

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