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- TL;DR Summary
- I am trying to decide which scheme to follow....

I am using square roots, however, I am confused over how many significant figures (s.f.) to keep.

Suppose I have ##\sqrt{3.0}##, which has 2 s.f.

From three different sources, I'll put a summary in brackets:

https://www.kpu.ca/sites/default/files/downloads/signfig.pdf

(if 2 s.f. in the data, keep 3 s.f. in the result; this also appeared in the answers for Kleppner's Introduction to Mechanics)

http://cda.morris.umn.edu/~mcintogc/classes/modern/sigfig.htm

(if 2 s.f., keep 2s.f.)

https://math.stackexchange.com/ques...cant-figures-involving-radicals-and-exponents

(if 2 s.f., keep 2s.f.)

So, which is correct (not for high school, but for Physics in general)? Thanks in advance.

Suppose I have ##\sqrt{3.0}##, which has 2 s.f.

From three different sources, I'll put a summary in brackets:

https://www.kpu.ca/sites/default/files/downloads/signfig.pdf

(if 2 s.f. in the data, keep 3 s.f. in the result; this also appeared in the answers for Kleppner's Introduction to Mechanics)

http://cda.morris.umn.edu/~mcintogc/classes/modern/sigfig.htm

(if 2 s.f., keep 2s.f.)

https://math.stackexchange.com/ques...cant-figures-involving-radicals-and-exponents

(if 2 s.f., keep 2s.f.)

So, which is correct (not for high school, but for Physics in general)? Thanks in advance.