The document defines 14 common scientific quantities along with their standard international (SI) units. It provides the name of each quantity, its associated SI unit, and a brief definition or explanation of what is being measured or quantified. The quantities include common measures like weight, speed, density, and others related to mechanics, energy, electricity, and waves.

1. Quantity SI Unit Definition
Weight N Force on an object due to gravity
Period s Time needed to complete one oscillation
Density kg/m3 Mass per unit volume
Speed m/s Distance travelled per unit time
Acceleration m/s2 Change in velocity per unit time
Force N Rate of change in momentum
Moment of Force Nm Turning effect of a force about a point and is
calculated by multiplying the force and the
perpendicular distance from the pivot.
Work Done J Amount of energy converted by a force
acting through a distance
Power W Rate of Work Done
Pressure Pa, N/m2 Amount of force exerted normally on an
object per unit area
Specific Heat Capacity J/(kg K) Amount of heat required to raise unit mass
of a substance by unit temperature
Specific Latent Heat J/kg Amount of heat required to change the state
of a unit mass of the object without any
change in temperature
Frequency Hz Number of cycles completed per unit time
Wavelength m Distance between two successive points on
waves that are in phase
Potential Difference V Amount of energy converted to other forms
of energy when one coulomb of positive
charge passes between the points.
E.M.F V Work done by the source in driving a unit
charge round a complete circuit.