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Glossary: Home Tables A B C D E F G H I J K L M N O P Q R S T Th U V W X Y Z

velocity *
Over the range of matter (ie 1 nanometre to 1 gigametre), velocity varies very little. It is more useful to set velocities to a reasonable size, and let time and length fall together. See Density-Velocity-Time.
      The following table shows example speeds in varing units.
Sample Metric Imperial Notes
speed of light 299 792 458 m/s
1 079 252 848.8 km/h
983 574 900 ft/s
670 619 250 mph
582 379 875 kn
The electromagnetic velocity
Earth orbit-speed 29 786 m/s
107 230 km/h
97 724 ft/s
66 630 mph
57 863 kn
orbit vel * year³ = const for sun
Thermal velocities 288.663 m/s
1039.187 km/h
947 ft/s
645.721 mph
560.76 kn
sqrt(atm pressure / denity)
      Sound, particle speed are of this order.
VIOF - Vingt Inch-Ounce-Second *
A base-20 metric-like system. The DKTS system is also a 20-power of this system: this means that its units are also vingt-units.
Length cubit = 500 mm
inch = 25 mm
line = 1.25 mm
League (4 km) \ 20 furlong \ 20 chain \ 20 cubit \ 20 inch
Also: foot = 12 inches, mile = 6000 feet,
Mass pound = 312.5 g
ounce = 15.625 g
Last (2.5 t) \ 20 seam \ 20 stone \ 20 pound
Ounce \ 20 drachm \ 20 grain \ 20 mites
Time second = 1 s facc = 0.05 s
Thremm deg = 0.5 K mill = 1/16000 K
Charge coulomb = 5/32 C In the cubit-pound-second UES MI=20**6
The values of the metrological constants in Vingt-metric go like the following.
Constant value VIOF VCPS VIOS
Length - inch cubit ounce
Mass - ounce pound ounce
Time - facc second second
Thremm - mill deg deg
Gravity 0.980665   V0 in/f/f V1 cubit/s/s V2 inch/s/s
Spec Heat 1.0467 V0 'J'/ oz mK V3 'J'/lb K V5 'J'/oz K
Water 1.0000 V0 oz/cu in V4 lb/cu cubit V0 oz/cu in
UES-MI - 20**6 1 20**6
Charge in SI 62.5 C .15625 C 62.5 C
volume-of *
These are informal volume-of units.
      Olympic Pool: an acre-yard, or 3.75 megalitres
      Royal Albert Hall: 99,100 cu m or 3,500,000 cu ft
      Cubic Acre: 9,091,421 cu ft = 257440 cu m
      Sydney Harbour: 400,000 acre feet = 493392 ML


© 2003-2004 Wendy Krieger