Understanding SI Units - Physics

Degrees Celsius is a measurement of temperature, but is not an SI unit. The SI unit for temperature is Kelvin.

Moles are the SI unit for amount of substance in terms of atoms. Ampere is the SI unit for current. Pascal is the SI unit for pressure. Hertz is the SI unit for frequency.

Degrees Celsius is a measure of temperature, but the SI unit for temperature is Kelvin.

Amperes are the SI unit for current, Ohms are the SI unit for resistance, Farads are the SI unit for capacitance, and watts are the SI unit for power.

While Heisenberg is a famous chemist and physicist, no units have been named after him.

Watts are the SI units for power, Joules are the SI unit for energy, Ohms are the SI unit for resistance, and Henrys are the SI unit for inductance.

A vector is not a unit of measurement. A vector is a quantity with both magnitude and direction. This is different from a scalar, which has only magnitude but no direction. All units of measurement can be classified as either vectors or scalars. For example, velocity is a vector and speed is a scalar.

Kilograms are the SI units for mass. Farads are the SI unit for capacitance. Newton-meters are a compound SI unit that measure torque, and are equivalent to Joules. Seconds are the SI unit for time.

While a minute is an accurate measurement of time, the official SI unit for time is the second. That's why velocity is given in and acceleration is given in .

Meters are the SI unit for length or distance. Joules are the SI unit for work or energy. Volts are the SI unit for electric potential. Ohms are the SI unit for electrical resistance.

While a kilometer is a metric unit of distance, the correct SI unit for distance is the meter. When making calculations with length, it is necessary to convert kilometers to meters.

Seconds are the SI unit for time. Ohms are the SI unit for electrical resistance. Farads are the SI unit for capacitance. Teslas are the SI unit for magnetic field strength.

First, when thinking about SI you should usually start with the metric system -- this leaves us with meter and kilometer. The correct SI unit for distance is the meter -- displacement is in meters, velocity is in meters per second, etc.

The SI unit to measure mass is kilograms. Ounces are also used to measure mass, but are not an SI unit.

Liters are the SI units for volume. Meters are the SI unit for distance. Hertz are the SI unit for frequency.

When in doubt, stick with the metric system. Ounces is an Imperial unit, used almost exclusively in the United States.

Most SI units use the metric system. Liters is the SI unit for volume.

Ounces and pounds are measures of mass, but kilograms are the SI unit for mass. Miles are a measure of distance, but the SI unit for distance is meters. Hours are a measure of time, but the SI unit for time is seconds.

A Newton is a unit of force. Remember Newton's second law: .

If you solve this equation purely in terms of units, you can find the equivalent unit for force.

Replace force with Newtons, mass with kilograms, and acceleration with meters per square-second.

Using dimensional analysis, we can find the equivalent units of virtually any measurement.

A calorie is a metric measurement of energy. The standard SI unit for energy is a Joule.

Watts are the SI units for power and teslas are the SI unit for magnetic strength.

Inches are a measure of length, but the SI unit for length is meters.

Seconds are the SI units for time, Amperes are the SI units for electrical current, and Ohms are the SI units for resistance.

Farads are the SI unit for capacitance.

Leagues and chains are measures of distance, but the SI unit for distance is meters. Acres are a measure of area, the square of a distance. The SI unit for area would be meters-squared. Pints are a unit of volume, but the SI unit for volume is liters.

Candles is a measure of brightness, but the SI units for brightness are lumens.

Teslas are the SI unit for magnetic field strength, Newtons are the SI unit for force, and sieverts are the SI unit for quantifying radiation.

Volts are the SI unit for electromotive force, or electric field strength.

Charge is not a unit, but a property; the SI unit for charge is Amperes. Quarts are a measure of volume, but the SI unit for volume is liters. Hours are a measure of time, but the SI unit for time is seconds. Knots are a measure of velocity, but the SI unit for velocity is meters per second.

Gallons are a measure of volume, but the SI units for volume are liters.

Webers are the SI unit for magnetic flux, watts are the SI unit for power, Coulombs are the SI unit for charge, and meters are the SI unit for length.

While Erwin Schrödinger was a physicist, there is currently no unit named after him.

Newtons are the SI unit for force, Farads are the SI unit for capacitance, Coulombs are the SI unit for charge, and hertz are the SI unit for frequency.

Joules are the SI unit for energy.

Fathoms, yards, and inches are all measures of length, but the SI units for length are meters. Acres are a measure of area, but the SI unit of area would be meters-squared.

This is a straightforward problem, but requires a number of unit conversions. To find the speed, we will need to determine the change in distance per unit time:

While we are given distance and time, we need to convert it to meters per second. A distance of is converted to meters with the relation .

Time requires several step-wise conversion. First, convert the hours to minutes.

Find the total number of minutes and convert it to seconds.

Finally, find the total number of seconds.

Use the final distance and final time to calculate the speed in meters per second.

The correct SI unit for power is the Watt, which is equivalent to Joules per second. Joules are used to measure energy or work.

Coulombs are the SI unit for electrical charge and lumens are the SI units for brightness. Horsepower is a non-SI unit for power.