Units of Measurement

Which unit system underlies the data, and why standardize units?

Reported figures follow the International System of Units (SI), the metric standard used throughout scientific and industrial practice. Standardizing on a single system keeps quantities directly comparable across countries, regardless of local measurement conventions.

How are imperial and metric units reconciled?

Imperial and other non-SI units are converted to their SI equivalents using fixed conversion factors. The table below groups the units encountered by quantity; the precise conversion factors are maintained in Intratec's Unit Conversion document, with three commonly referenced values noted inline.

Conversion Reference

Quantity	Units	Notes / key factors
Length	inch (in), foot (ft)	Converted to metres (m)
Area	square inch (in²), square foot (ft²), hectare (ha)	Converted to square metres (m²)
Volume	cubic foot (ft³), litre (L), gallon (gal), barrel (bbl)	1 bbl = 0.1589 m³
Mass	pound (lb), metric ton, short ton	Converted to kilograms (kg)
Pressure	bar, atmosphere (atm), pound per square inch (psi)	Converted to pascals (Pa)
Temperature	degree Celsius (°C), Rankine (R), degree Fahrenheit (°F)	Base unit: kelvin (K)
Time	hour (h), day (d), year (yr)	1 yr = 8,760 h
Energy	British thermal unit (Btu), kilowatt-hour (kWh), calorie (cal)	1 Btu = 1,055.06 J