Mass Conversion Guide
Mass is a fundamental property of matter representing its resistance to acceleration. It is distinct from weight, which is a force. The SI base unit is the kilogram (kg), the only SI base unit still defined by a physical artifact until 2019 when it was redefined via the Planck constant.
Key conversions: 1 lb = 0.453592 kg, 1 kg = 2.20462 lb, 1 metric ton = 1,000 kg = 2,204.62 lb, 1 short ton = 2,000 lb = 907.185 kg, 1 long ton = 2,240 lb = 1,016.05 kg, 1 oz = 28.3495 g, 1 Troy oz = 31.1035 g.
Mass measurement is central to structural loading calculations, material procurement, shipping logistics, chemical stoichiometry, and quality control. Industries from aerospace to food processing depend on precise mass measurement.
Common pitfalls: confusing the three types of ton (up to 12% difference), treating mass and weight as interchangeable (they differ on the Moon or in pressurized systems), and misreading MT as megatonne instead of metric ton.