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The kilogram per cubic metre (symbol: kg·m −3, or kg/m 3) is the unit of density in the International System of Units (SI). It is defined by dividing the SI unit of mass, the kilogram, by the SI unit of volume, the cubic metre. [1]
At 0 °C, the freezing point of water, a cubic metre of water has slightly less mass, 999.972 kilograms. A cubic metre is sometimes abbreviated to m^3 , M3 , m**3 , cum , m3 , CBM , cbm when superscript characters or markup cannot be used (e.g. in some typewritten documents and postings in Usenet newsgroups).
1 000 000 000 000 000 000 000 000: 10 24: zetta Z 1 000 000 000 000 000 000 000: 10 21: exa E 1 000 000 000 000 000 000: 10 18: peta P 1 000 000 000 000 000: 10 15: tera T 1 000 000 000 000: 10 12: giga G 1 000 000 000: 10 9: mega M 1 000 000: 10 6: kilo k 1 000: 10 3: hecto h 100 10 2: deca da 10 10 1 (none) (none) 1 10 0: deci d 0.1 10 −1 ...
An overview of ranges of mass. To help compare different orders of magnitude, the following lists describe various mass levels between 10 −67 kg and 10 52 kg. The least massive thing listed here is a graviton, and the most massive thing is the observable universe.
1 kg = (299 792 458) 2 / (6.626 070 15 × 10 −34)(9 192 631 770) h Δν Cs / c 2 . All units in the SI can be expressed in terms of the base units, and the base units serve as a preferred set for expressing or analysing the relationships between units.
The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10 −34 when expressed in the unit J⋅s, which is equal to kg⋅m 2 ⋅s −1, where the metre and the second are defined in terms of c and Δν Cs. —
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If the logs are less than 1 m, the volume of visible wood decreases because the voids are better occupied. Thus the "stere" no longer corresponds to 1 m 3 , but to 0.8 m 3 (28.3 cu ft) for 50 cm (19.7 in) logs, 0.7 m 3 (24.7 cu ft) for 33 cm (13.0 in) logs and 0.6 m 3 (21.2 cu ft) for 25 cm (9.8 in) logs.