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Useful numbers to memorize (idea)
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(
idea
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by
pi
Thu Jan 10 2002 at 11:58:49
one
year
= 3e7 seconds - useful for those "if everyone on
Earth
did ~ one time every second" ideas
1
meter
per
second
= 2.16
mph
- this is useful for estimating speeds by sight.
one
hour
= 3600
second
s
one mile = 1.6 km (and one km = 0.6 miles - see
golden ratio
speed of light
in a
vacuum
= 3e8 m/s
one
mile
= 5280
feet
one
square mile
= 640
acre
s
one
acre
is ~ 209
feet
on a side
one
ounce
= 28
grams
one
kilogram
= 2.2
pounds
(1 + 1/n)^n approaches
e
as n goes to
infinity
. So the sequence 1.5
2
, 1.25
4
, 1.1
10
, 1.05
20
etc goes to e.
1 mb of
mp3
= 1 minute of sound at
128 kbps
Golden ratio
Infinite expected value
gomi no sensei
English units / Metric conversion factors
Bingbang Babbaloo Battles Burpers
e
Quick unit conversion
mile
infinity
CPUID
The Birth of Conversion
Unit Conversion
Gravity
meter
second
Russia
Currency of the World
Star Island
Unit conversion formulae
Everything Kitchen Conversion Table
Volume Conversion Factors
Area Conversion Units