Understanding Mass vs. Weight
In scientific terms, mass is the intrinsic quantity of matter in an object, measured in kilograms, whereas weight is the gravitational force acting upon that mass. In everyday commerce and engineering, the terms are used interchangeably under Earth standard gravity (9.80665 m/s┬▓).
Mathematical Formula
1 Pound (lb) = 0.45359237 Kilograms (kg)
1 Kilogram = 2.20462262 Pounds
1 Kilogram = 2.20462262 Pounds
Step-by-Step Worked Example
To convert 150 Pounds to Kilograms:
1. 150 × 0.45359237 = 68.0388555 kg
2. Rounded to 2 decimals: 68.04 kg.
Important Considerations & Limitations
Avoirdupois weight units are used for all standard measurements. Precious metals use Troy weight (where 1 troy ounce Ôëê 31.1035 g), which differs from standard commercial ounces.
Authoritative References
BIPM: The International System of Units (SI) Brochure.