julie389
Posts: 1
Joined: Tue Nov 12, 2013 9:30 pm
Occupation: Parent

metric measurements for "how well do disinfectants work"

Postby julie389 » Tue Nov 12, 2013 10:16 pm

We received a note from my daughter's teacher asking how we would measure using the metric system. Other than the amount of disinfectant we use what would we measure??

HeatherL
Former Expert
Posts: 895
Joined: Tue Sep 06, 2005 3:59 pm
Occupation: Professor

Re: metric measurements for "how well do disinfectants work"

Postby HeatherL » Wed Nov 13, 2013 9:05 am

Hello,

I think you are doing this excellent Science Buddies project: http://www.sciencebuddies.org/science-f ... p012.shtml

In terms of measurements, your dependent variable is the number of bacterial colonies, which is not a metric measurement but it perfectly valid. You are correct in saying you will measure the amount of disinfectant. This can happen two ways: (1) volume (milliliters or liters) and (2) concentration. Measuring volume in milliliters or liters would be a good use of the metric system.

I hope this helps. Please post again (in this same thread) if you have more questions.

Heather


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