Whenever two measurements are equal or equivalent a ratio of these two measurements will equal what?

Whenever 2 measurements are equal or equivalent a ratio of these 2 measurement will equal 1. I believe.

7is b8 is d9 is c10 is a11 is d

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.