Sistem Satuan Internasional

Satuan besar dalam ilmu alam merupakan hasil perjanjian yang dituangkan dalam suatu sistem, yang disebu dengan ' system international' atau disebut juga dengan sistem MKS singkatan dari Meter, Kilo dan Sekon atau sistem CGS singkatan dari Centi, Gram dan Sekon

Sistem satuan yang banyak dipakai

Sistem Panjang

• 1 inch = 25,4 mm = 2,54 cm = 0,0833 feet = 0,025 meter
• 1 foot = 12 inch = 0,305 meter = 30, 48 cm = 0,333 yard
• 1 yard = 36 inch = 3 feet = 0,914 meter
• 1 meter = 39,37 inch = 3,281 feet  = 1,094 yard
• 1 kilometer = 1000 meter = 0,612 mile
• 1 mile = 1,6093 km = 5280 feet = 1760 yard
• 1 Nautical mile = 1,852 km = 60,80 feet

Satuan luas

• 1 cm2 = 0,155 in2 = 100 mm2 = 0,0001 m2
• 1 meter2 = 1,196 yard 2 = 10,764 feet2
• 1 inch2 = 645,163 mm2 = 0,0069 feet2 = 6,4516 cm2
• 1 foot2 = 929,03 cm2 = 144 inch2 =0,1111 yard2
• 1 yard2 = 0,8361 m2 = 1,296 inch2 = 9 feet2
• 1 acre = 0,405 hectare = 8,840 yard2
• 1 kilometer2 = 0,386mile2 = 100 hectare

Satuan isi ( volume)

• 1 cm3 = 0,001 dm3 = 0,6102 in3 = 1000 mm3
• 1 dm3 (1liter) = 61,026 in3 = 0,03531 ft3 = 1000 cm3
• 1 meter3 = 1000 dm3 = 1,30795 yard3 = 35,3146 feet3
• 1 inch3  = 0,0164 dm3 =16,3871 cm3
• 1 foot3 = 28,316 dm3 = 0,02832 m3 = 1.728 in3
• 1 american gallon = 231 in3 = 3,7854 liter = 0,8327 imperial gallon = 4.546 liter
• 1 Imperial gallon = 277,4 in3 = 277,4 in3 = 4.546lieter = 1,2009 American gallon = 0,1604 ft3
• 1 American barrel = 158,98 liter = 5,6138 feet3 = 42 American gallon =9,702 in3

Satuan Berat

• 1 ounce (oz) = 28,35 grammes
• 1 pound (lb) = 0,454 kiogramme = 0,009 cwt
• 1 hundredweight (cwt) = 112 lbs = 50.802kg
• 1 kg = 2.2046 lbs = 0.01dz = 1000 grammes
• 1 quintal (dz) = 100 kg = 220.5 lbs
• 1 Metric ton = 1000 kg = 0.98421 American longton = 1.1023 american short tons = 2.204,6 lbs
• 1 English ton = 1 american longton = 1.12 american short ton = 1.01605 metric ton = 2240 lbs
• 1 american short ton = 0.89286 english ton = 0.89286 american longton = 0.090718 metric ton = 2000 lbs

Satuan - satuan Tenaga dan Panas

• 1 horse power (hp) = 550 foot pounds per second = 0.746 kw = 1.014 metric horse power = 76.04 kg m/s = 634 kg calories / hour
• 1 metric horse power = 542 foot pounds per second = 0.736 kw = 0.986 horse power = 75 kg m /s = 632 kg calories / hour
• 1 kw = 1000 watts = 1340 hp = 1359 mhp = 737 foot pounds per second = 102 kg m/ s
• 1000 Btu = 252 kg calories = (large calories) = 0.393 horse power hour = 0.398 metric horse power hour = 0.293 kilowatt hour
• 1000 kg calories (large cal.) = 3968 Btu = 1.559 horse power hour = 1.580 metric horse power hour = 1.163 kwh
• 1kwh = 3.411 Btu = 1.340 hph = 1.360metric horse power hour = 859.6 kg calories (large calories)
• 1Btu/lb = 0.555 kcl/kg

Sistem satuan tekanan (pressure)

• 1 pascal = 0,0075 mmHg= 1N/m2 = 10dyn/cm2
• 1Kpa = 0,2953 in Hg = 1.000 pascal = 0,145 lb/in2 = 7,5006 mmHg = 0,0102 Kg/cm2 = 0,0098 atm
• 1 bar = 750 mmHg = 100Kpa = 106 dyn / cm2
• 1 atmosfir = 760 mmHg = 101,32 KPa = 1,0132 bar = 29,92 in Hg = 1,033 Kg/cm2 = 14,696 lb/in2
• 1 inch Hg = 25,44 mm Hg = 0,345 Kg/cm2 = 0,032 atm
• 1 kg/cm2 = 735,55 mm Hg = 14,223lb/in2 = 0,967 atm
• 1 lb/in2 (PSI) = 51,714 mm Hg = 0,070 kg/cm2 = 0,068 atm = 2,036 in Hg = 6.894,7 pascal = 144 lb/ft2