Sig Digits

Question 1

Sig Digits

Answer 1

Digits are grouped in three using a space instead of commas; e.g. 1 674.14.
Leave a space between the last digit and the SI unit: e.g. 12.5 m
Do not use a period after the SI unit.
Units are not pluralized.
Use product dots between different SI units; e.g. kPa·L/mol·K
Do not mix words & symbols; meter/s should be m/s or meter per second
Use symbols instead of full names for units, with numerals; e.g. 458 cm
Use prefixes so that numerals lie between 0.1 and 1000; e.g. 55 000 g should be 55 kg

Question 2

Sig Fig Rules

Answer 2

All nonzero digits are significant. 28.03 0.0540
Interior zeros are significant. 408 7.0301
Leading zeros are not significant. 0.0032 0.00006
Trailing zeros are sometimes significant:
after a decimal point are significant 45.000 3.5600
before a decimal point are significant 140.00 2500.55
before an implied decimal point are ambiguous and scientific notation should be used.