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Unit Type Description
Absolute Zero Temperature -273.16° C
-459.69° F
0° K (Kelvin)
Gravity (Earth) Acceleration 32.174 ft/sec2
9.8 m/sec2
Gross Quantity 144 (1 dozen dozen or 122)
Knot Speed 1.15 statute miles per hour
(1 nautical mile per hour)
Light Speed Speed 186,000 miles/sec
299,792,458 m/sec
Light Year Distance distance light travels in a year
9,461,000,000,000 km
(5,880,000,000,000 mi)
Pi Ratio 3.141592653589793238
Ream Quantity 500 sheets
typically used for paper
Sound Speed
Speed 1,088 ft/sec = Mach 1
(in air@STP)

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