[ML²T⁻³] J s⁻¹ or watt.
By adding the absolute errors of a and b.
The relative error expressed in percentage.
1 liter = 10^-3 m³.
Δx = ±(Δa + Δb)
(a ± Δa) and (b ± Δb)
3 significant figures.
Length (metre), Mass (kilogram), Time (second), Temperature (kelvin), Electric current (ampere), Luminous intensity (candela), Amount of substance (mole).
It is (1/273.16) part of the thermodynamic temperature of the triple point of water.
A complete set of units, both fundamental and derived, for all kinds of physical quantities.
The arithmetic mean of the magnitude of absolute errors in all measurements.
Velocity, measured in ms⁻¹.
Units of physical quantities that are independent of each other.
The least number of significant figures from the values involved.
1 erg = 10^-7 J.
Seven fundamental units and two supplementary fundamental units.
Digits in a number that contribute to its precision.
[L³] metre³.
Physical quantities derived from fundamental quantities, such as velocity, acceleration, and force.
The least decimal place from the values being added or subtracted.
1 pascal = 1 N/m².
It shows how and which of the base quantities represent the dimensions of a physical quantity.
Not provided in the text, but it typically involves the relative errors of a and b.
1 pound = 0.4537 kg.
A cylindrical prototype mass made of platinum and iridium alloys, equivalent to 5.0188 x 10^25 atoms of carbon-12.
The time in which a cesium atom vibrates 9,192,631,770 times in an atomic clock.
If the preceding digit is odd, it is raised by one; if even, it remains unchanged.
1 micrometre = 10^-6 m.
The lack of accuracy due to instrument limits or other causes.
The comparison of any physical quantity with its standard unit.
1 amu = 1.66 x 10^-23 kg.
[ML⁻¹T⁻²] Nm⁻².
Radian (rad).
The amount of substance containing as many elementary entities as there are atoms in 0.012 kg of carbon-12.
[L²] metre².
[MLT⁻²] newton (N).
5 significant figures.
1 kgfm² = 9.81 N/m².
As the electric current that produces a force of 2 x 10^-7 N per metre length between two parallel conductors placed one metre apart in vacuum.
1 angstrom = 10^-10 m.
Yes, they are significant figures.
3 significant figures.
1 dyne = 10^-5 N.
They can be used to check the accuracy of equations, convert between systems of units, and relate different physical quantities.
1 kWh = 3.6 x 10^6 J.
1 metric ton = 10^3 kg.
It is the arithmetic mean of the measured values.
Quantities in terms of which laws of physics are described and whose measurement is necessary.
A definite amount of a physical quantity that is easily reproducible and internationally accepted.
1 kgf = 9.81 N.
Steradian (Sr).
Centimetre for length, gram for mass, and second for time.
4 significant figures.
Addition, subtraction, multiplication, and division.
The number of digits in a measured value that are known to be correct plus one doubtful digit.
Units that measure plane angle (radian) and solid angle (steradian).
It is (1/60) of the luminous intensity of an ideal source at the melting point of platinum (1760°C).
Metre for length, kilogram for mass, and second for time.
The difference between the true value and the measured value of a quantity.
The ratio of mean absolute error to the true value.
If the dimensions of the left-hand side of an equation are equal to the dimensions of the right-hand side, then the equation is dimensionally correct.
As the distance that contains 1,650,763.73 wavelengths of orange-red light of Kr-86.
The preceding digit remains unchanged.
1 horsepower = 746 W.
The preceding digit is raised by one.
Foot for length, pound for mass, and second for time.
