Water could be made to boil at 105°C instead of 100°C by adding a lot of energy to the water
increasing the external pressure

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.