# What is the mass in kg of a person who weighs 185 pounds?

Jul 24, 2016

$\text{185 lb"~~"84.2 kg}$

#### Explanation:

This question can be answered by using dimensional analysis.

The relationship between kilograms and pounds is $\text{1 kg=2.20 lb}$.

This gives us two conversation factors:

$\text{1 kg"/"2.20 lb}$ and $\text{2.20 lb"/"1 kg}$

Multiply the given dimension $\left(\text{185 lb}\right)$ by the conversion factor with the desired unit in the numerator. This will cancel the unit we wish to convert.

$185 \text{ lb"xx(1" kg")/(2.20" lb")="84.2 kg}$ rounded to three significant figures.