MathBench > Measurement

Logs and pH


By the way, if you know the log value and you want to find the original value of the number, how do you do it?

Use the anti-log, of course!! However, if your calculator doesn't have an anti-log key, you can raise 10 to the log, or use the 10x key. For example, the log of the pollen diameter was −4.5, therefore the diameter in meters is

10(−4.5) = 0.0000316 m

If you are using Google as a calculator, type "10^(−4.5) = " and hit enter.

How big is a fly's eye? The log of the diameter is −3.1...

(To make this problem interactive, turn on javascript!)

I think I have the answer: 10−3.1 = 0.00080 m.