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Current Shareware 1994 January
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SHAR194.ISO
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N4.DAT
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1993-08-13
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Charts and Conversions
--------------------------
Water Hardness Chart
┌─────────────────────────────────────────────────────┐
│ dH° Mg/litre CaCO3 Considered as │
├─────────────────────────────────────────────────────┤
│ 0 - 3 0 - 50 Soft │
│ 3 - 6 50 - 100 Moderately soft │
│ 6 - 12 100 - 200 Slightly hard │
│ 12 - 18 200 - 300 Moderately hard │
│ 18 - 25 300 - 400 Hard │
│ 25+ 450+ Very hard │
└─────────────────────────────────────────────────────┘
pH Scale
Acidic N Alkaline
0 1 2 3 4 5 6 7 8 9 1 1 1 1 1
0 1 2 3 4
├───┴───┴───┴───┴───┴───┴──┬┴───┴───┴───┴───┴───┴───┴───┤
6.8 ± .2 ≈ Average for Tropical Fish
┌────────────────────────────────────────┐
│ Average Composition of Clean, Dry Air. │
│ └───────────────────────────┐
├────────────────────────────────────┬──────────────────────────────-┤
│ N2 Nitrogen 78.084 │ CO Carbon Monoxide * │
│ O2 Oxygen 20.946 │ N2O Nitrous Oxide * │
│ Ar Argon .934 │ SO2 Sulfer Dioxide * │
│ CO2 Carbon Dioxide .0325 │ NO Nitric Oxide * │
│ Ne Neon * │ NO2 Nitrogen Dioxide * │
│ Kr Krypton * │ HCHO Formaldehyde * │
│ Xe Xenon * │ NH2 Ammonia * │
│ CH4 Methane * │ O3 Ozone * │
│ H2 Hydrogen * │ │
└────────────────────────────────────┴───────────────────────────────┘
* Trace elements (extremely small percentages)
Commonly used prefixes
Decimal Location Prefix Symbol
--------------------------------- ------ ------
1,000,000,000,000 = 10^12 tera T
1,000,000,000 = 10^9 giga G
1,000,000 = 10^6 mega M
1,000 = 10^3 kilo k
100 = 10² hecto h
10 = 10^1 deka da
0.1 = 10^-1 deci d
0.01 = 10^-2 centi c
0.001 = 10^-3 milli m
0.000 001 = 10^-6 micro µ
0.000 000 001 = 10^-9 nano n
0.000 000 000 001 = 10^-12 pico p
0.000 000 000 000 001 = 10^-15 femto f
0.000 000 000 000 000 001 = 10^-18 atto a
Unit Conversion Factors
Length
------
1 m = 100 cm = 1000 mm = 10^6 µm = 10^9 nm
1 km = 1000 m = 0.6214 mi
1 m = 3.281 ft = 39.37 in
1 cm = 0.3937 in
1 in = 2.540 cm
1 ft = 30.48 cm
1 yd = 91.44 cm
1 mi = 5280 ft = 1.609 km
1 nauticle mile = 6080 ft
1 light year = 9.461 x 10^15 m (I bet you really wanted to know that)
m = meter; in = inch; ft = foot; yd = yard; mi = mile
Area
----
1 cm² = 0.155 in²
1 m² = 10^4 cm² = 10.76 ft²
1 in² = 6.452 cm²
1 ft² = 144 in² = 0.0929 m²
Volume
------
1 liter = 1000 cm^3 = 10^-3m^3 = 0.03531 ft^3 = 61.02 in^3
1 ft^3 = 0.02832 m^3 = 28.32 liters = 7.477 gallons
1 gallon = 3.788 liters
Mass
----
1 kg = 10^3 g = 0.0685 slug
1 g = 6.85 x 10^-5 slug
1 slug = 14.59 kg
1 u = 1.661 x 10^-27 kg
1 kg has a weight of 2.205 lbs when g = 9.80 m/s²