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Non-SI units temporarily accepted for use with SI

Physical quantity	Unit name	Unit symbol	Expression in SI units
length	nautical mile	-	1852 m
velocity	knot	-	nautical mile per hour = (1852/3600) m s^-1
area	are	a	da m² = 10² m²
area	hectare	ha	hm² = 10⁴ m²
pressure	bar	bar	0.1 MPa = 100 kPa = 1000 hPa = 10⁵ Pa
length	ångström	Å	0.1 nm = 10^-10 m
area	barn	b	100 fm² = 10^-28 m²

Table 7. Non-SI units temporarily accepted for use with SI.

The above table lists some other non-SI units which are currently accepted for use with the SI to satisfy the needs of commercial, legal and specialised scientific interests. These units should be defined in relation to the SI in every document in which they are used. Their use is not encouraged.

Si Units:

	SI Base Units
	SI Derived Units
		expressed with special names
		expressed in terms of SI base units
		expressed in terms in terms of SI units with special names
	SI Unit Prefixes
	Non-SI Units
		accepted by SI
		currently accepted by SI
		derived CGS units with special names
		other non-SI units
	Constants
	Glossary of Units

CONVERSION CALCULATORS

Convert between Different Units of Measurement

Index of Unit Converters

ACCELERATION	ANGLE	AREA	AREA DENSITY
DENSITY	DISTANCE	DYNAMIC VISCOSITY	ENERGY
ENERGY DENSITY	ENTROPY	FEED RATE	FLOW RATE
FORCE	FUEL CONSUMPTION	HEAT CAPACITY	HEAT FLUX DENSITY
HEAT TRANSFER COEFFICIENT	IRRADIANCE	KINEMATIC VISCOSITY	LENGTH
MASS	POWER	PRESSURE	SPECIFIC ENERGY
SPECIFIC ENTHALPY	SPECIFIC ENTROPY	SPECIFIC HEAT CAPACITY	SPECIFIC VOLUME
SPEED	TEMPERATURE	THERMAL CONDUCTIVITY	TIME
TORQUE	VELOCITY	VOLUME	VOLUMETRIC HEAT CAPACITY
Unit Prefixes	Plasma Gas Flow	HV MPa - GPa

To use the measurement conversion calculators simply enter a number value into the desired field and click calculate. All results shown will be equivalent values. Values are given to seven significant figures ( the odd result may show 9's or 0's over running). Values of 10 000 or greater will be displayed in the e-format e.g. 2.3456e7 which equals 2.3456 x 10⁷ or 23 456 000. Values lower than 0.001 will be displayed in the e-format e.g. 2.3456e-5 which equals 2.3456 x 10^-5 or 0.000 023456. The calculators require that your browser has java script enabled. View all measurement unit conversion calculators on the same page (may not work with all browsers; requires Iframe).

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Gordon England Independent Thermal Spray Coating Consultant

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