aire : 1 a (are) = 100 m2 , 1 ha (hectare) = 1 are2 = 100 x 100 = 10 000 m2
couleur : RVB (rouge, vert, bleu); CMJ (cyan, magenta, jaune)
énergie: 1 kWh (kilowatt-heure) = 3 600 kJ (kilojoules)
longueur : 1 km = 103 m = 106 mm
poids : 1 t (tonne) = 103 kg = 106 g
puissance : P = en watt (W) ou kilowatt (kW)
temps : 1 jour = 24 h = 24 x 60 min = 1400 min = 1440 x 60 s = 86400 s
vergence : +1 ∂ (dioptrie) = distance focale image de 1/v = 1 m
volume : 1 l (litre) = 1 dm3 = 103 cm3 = 103 ml
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