Question

define what is meant by signifiacnt figures and order of magnitude​

Answer 1

Significant figures refers to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation . The number of significant figures in an expression indicates the confidence or precision with which an engineer or scientist states a quantity.

Order of magnitude means a class in a system of classification determined by size, typically in powers of ten. "An order of magnitude is an exponential change of plus-or-minus 1 in the value of a quantity or unit. The term is generally used in conjunction with power-of-10 scientific notation."

Answer 2

Answer:

Significant figure is a number in chemistry of any digit.

According to it's rules for example

in 6 there are 1 significant number.

But in 6.000 there are 4 significant number or significant figure.