What is the correct way to write 0.250 m in scientific notation

m

The decimal number must be between 1 and 10. The decimal place moves 5 places to reach 2.5, hence 10^-5

14 days is the half-life of phosphorus-32

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.