Physics
SI Units and Conversion Factors
More Articles
- SI Units And Conversion Factors
- Unit and Dimension
- Motion in Daily Life
- Work, Energy and Power
- Gravitation and Gravity
- Pressure in Liquids and Atmosphere
- Floatation in Liquids
- Surface Tension Made Simple
- Simple Harmonic Motion
- From Terminal Velocity to Elasticity
- Waves and Sound
- Heat and Temperature
- Thermal Expansion & Heat Transfer
- Latent Heat & Thermodynamics
- Speed of Light & Refractive Index
- Laws of Reflection & Refraction
- Power of a Lens
- Human Eye Vision Defects
- What Is Electric Charge?
- What Is Electric Current?
- Key Concepts in Magnetism
- Nuclear & Atomic Physics
- The Basics of Electronics
- Scientific Instruments & Their Uses
- Famous Inventions and Discoveries
SI Units and Conversion Factors
SI Units and Their Symbols
Quantity |
SI |
Symbol |
---|---|---|
Length |
Meter |
m |
Mass |
Kilogram |
kg |
Time |
Second |
s |
Work and Energy |
Joule |
J |
Electric Current |
Ampere |
A |
Temperature |
Kelvin |
K |
Intensity of Flame |
Candela |
cd |
Angle |
Radian |
rad |
Solid Angle |
Steradian |
sr |
Force |
Newton |
N |
Area |
Square Meter |
m² |
Volume |
Cubic Meter |
m³ |
Speed |
Meter per second |
m/s |
Angular Velocity |
Radian per second |
rad/s |
Frequency |
Hertz |
Hz |
Moment of Inertia |
Kilogram Square Meter |
kg·m² |
Momentum |
Kilogram per Meter per second |
kg·m/s |
Impulse |
Newton Second |
N·s |
Angular Momentum |
Kilogram Square Meter per second |
kg·m²·s⁻¹ |
Pressure |
Pascal |
Pa |
Power |
Watt |
W |
Surface Tension |
Newton per meter |
N/m |
Viscosity |
Newton's second per square meter |
N·s·m⁻² |
Thermal Conductivity |
Watt per meter per degree Celsius |
W·m⁻¹·°C⁻¹ |
Specific Heat Capacity |
Joule per kilogram per Kelvin |
J·kg⁻¹·K⁻¹ |
Electric Charge |
Coulomb |
C |
Potential Difference |
Volt |
V |
Electric Resistance |
Ohm |
Ω |
Electrical Capacity |
Farad |
F |
Magnetic Induction |
Henry |
H |
Magnetic Flux |
Weber |
Wb |
Luminous Flux or Photometric Power |
Lumen |
lm |
Intensity of Illumination |
Lux |
lx |
Wavelength |
Angstrom |
Å |
Astronomical Distance |
Light Year |
Ly |
Conversion of Units from One System to Another
Conversion |
Value |
---|---|
Length Conversions |
|
1 Inch |
2.54 centimeters |
1 Foot |
0.3 meters |
1 Yard |
0.91 meters |
1 Mile |
1.60 kilometers |
1 Furlong |
220 yards |
1 Chain |
20.11 meters |
1 Nautical mile |
1.85 kilometers |
1 Angstrom |
10⁻¹⁰ meters |
1 Fathom |
1.8 meters |
1 Fathom |
6 feet |
1 Yard |
3 feet |
1 Mile |
5280 feet |
1 Square Inch |
6.45 square centimeters |
1 Square Foot |
0.09 square meters |
1 Square Yard |
0.83 square meters |
1 Square Mile |
2.58 square kilometers |
1 Nautical Mile |
6080 feet |
1 Acre |
104 square meters |
Mass and Weight |
|
1 Grain |
64.8 milligrams |
1 Dram |
1.77 grams |
1 Ounce |
28.35 grams |
1 Pound |
0.4537 kilograms |
1 Poundal |
0.1383 Newton |
1 Dyne |
10⁻⁵ Newton |
1 Horsepower |
746 Watts |
Volume Conversions |
|
1 Cubic Inch |
16.38 cubic centimeters |
1 Cubic Foot |
0.028 cubic meters |
1 Cubic Yard |
0.7 cubic meters |
1 Liter |
1000 cubic centimeters |
1 Pint |
0.56 liters |
Temperature |
|
37° Centigrade |
98.6° Fahrenheit |
50° Centigrade |
122° Fahrenheit |
-40° Fahrenheit |
-40° Centigrade |
32° Fahrenheit |
0° Centigrade |
Final Thoughts
SI units and conversion factors are essential for understanding measurements in science and daily life. From length, mass, and time to temperature and energy, these units help ensure consistency in scientific communication.
For instance, the meter (m) is used to measure length, while the kilogram (kg) measures mass. Conversion factors, like 1 inch = 2.54 centimetres or 1 pound = 0.4537 kilograms, enable easy transitions between different measurement systems. Whether you're working in science, engineering, or simply looking to make quick conversions, having a reliable guide to SI units is crucial for accuracy and clarity in all fields.
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