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Generally
The formula is very helpful with recurring arithmetic operations. Instead of again and again new find out, what is to be done with the length and width of a rectangle, in order to calculate its area, one should generally note this approach. This can happen in the form
Area = Length · Width .
If one now uses the initial letters of the internationally valid, usually terms taken from the English language for the terms area, length and width, would have to stand there
A = l · b .
A formula is thus a description, which arithmetic operations are to be applied to the designator necessary for the calculation.
Dimension/ identifierSi-Basic units boldface Units Conversation
Angel (at the wheel) ° (grad) 1° = 60' (angle minutes) 1 ' = 60" (angle seconds)
Angel (at the steering wheel) ° (grad)
(Ignition interval) angel ° (grad)
Compression ratio
Efficency
Air/fuel ratio
Friction
circumference/diameter 3,14159 ...
Density g/cm³ 1 g/cm³ = 1 kg/dm³ = 1 t/m³
(Mechanical) tension N/mm²
a a ccelerationm/s²
A A reamm², cm², dm², m², km² 1 km²=1.000.000 m² =10.000 cm² =100 dm²
b Width mm, cm, dm, m 1 m = 10 dm = 100 cm = 1000 mm
c Fuel c onsumption l/100 km
d Diameter, bore mm, cm 1 cm = 10 mm
E Energy Nm, Ws, J, kJ (Joule), kWh 1 Nm = 1 Ws = 1 J 1 kJ = 1000 J 1 kWh = 3600 kJ
f Frequency Hz (Herz), s-1 (1/s) 1 Hz = 1 Oszillation/s.
F F orceN, daN, kN 1 kN = 100 daN 1 daN = 10 N 1 N = 1 kg·m/s²
g Acceleration of gravity 9,81 m/s²
G Weight N, daN, kN 1 kN = 100 daN 1 daN = 10 N 1 N = 1 kg·m/s²
h Height mm, cm, dm, m 1 m = 10 dm = 100 cm = 1000 mm
i Ratio
I Current A (Ampere) 1 A = 1000 mA
K Capacitance Ah (Amperehours)
l Length mm, cm, dm, m, km 1 Seemeile = 1,852 km 1 Landmeile = 1,609 km 1 km = 1000 m 1 m = 10 dm = 100 cm = 1000 mm 1 Inch = 25,4 mm
m Mass g, kg, t (Tonne) 1 t = 1000 kg 1 kg = 1000 g 1 pound (lb) = 453,59 g
M Torque Nm (Newtonmeter) 1 N · 1 m = 1 Nm
n n umbers of revolutions s-1 (1/s) min-1 (1/min) 1 s-1 = 60 min-1
p p ressurePa (Pascal) mbar, bar, N/cm² 1 bar = 10 N/cm² 1 bar = 1000 mbar 1 bar = 100.000 Pa
P P owerVA (Volt·Ampere), W (Watt), kW, PS (Horsepower) 1 W = 1 J/s = 1 Nm/s = 1 kg·m²/s³ 1 W = 1 VA 1 kW = 1000 W 1 kW = 1,3596 PS 1 PS = 735,5 W
Q Heat quantity Nm, Ws, J, kJ (Joule) 1 Nm = 1 Ws = 1 J 1 kJ = 1000 J
r Radius, lever arm mm, cm, dm, m 1 m = 10 dm = 100 cm = 1000 mm
R R esistanceM , k , , m (Ohm) 1 M = 1000 k 1 k = 1000 1 = 1000 m
s Distance, stroke mm, cm, dm, m, km 1 km = 1000 m 1 m = 10 dm 1 dm = 10 cm 1 cm = 10 mm
t Time (t ime)h, min, s 1 h = 60 min 1 min = 60 s
t Temperature °C (grad Celsius) 0 °C = 32 °F, 100 °C = 212 °F
T Periodic time s (second)
T Temperature K (Kelvin) 0 °C = 273 K, 100 °C = 373 K
v Velocity (v elocity) km/h 1 m/s = 3,6 km/h 1 km/h = 0,278 m/s
U Voltage V (Volt) 1 V = 1000 mV
V V olumemm³, cm³ (ml), dm³ (Liter), m³ 1 m³ = 1000 dm³ (Liter) 1 dm³ (Liter) = 1000 cm³ (ml) 1 cm³ (ml) = 1000 mm³ 1 barrel = 159 dm³ (Liter) 1 gallon = 3,79 dm³ (Liter)
W W orkNm, Ws, J, kJ (Joule) 1 Nm = 1 Ws = 1 J 1 kJ = 1000 J
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2001-2014 Copyright programs, texts, animations, pictures: H. Huppertz - Email Translator: Don Leslie - Email: lesdon@t-online.de