(optional) You are given nine pennies. One penny was minted in 1980 and the other eight pennies were minted after 1982. The 1980 penny weighs 3.0 grams; the other pennies have copper and weigh only 2.5 grams. Assuming the mint dates are illegible, devise a method usin the balance shown to determine the heavier 1980 penny in only two trials. 3. less

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.