The unit of luminous intensity is candela.

The radian is the plane angle between two radii of a circle, which cut off on the circumference an arc, equal in length to the radius.

It should be invariable (should not change with time)

The units which are independent or cannot be derived from any other unit is called fundamental unit. Every unit of length is fundamental unit (irrespective of the system to which it belongs); millimeter, centimeter, meter, kilometer.

Coulomb is the fundamental unit of charge (q).

The unit of the Fahrenheit and Celsius scale is called as Degree and is denoted by ^o .

Angular velocity is considered to be a vector quantity, though it is often referred to as a pseudovector. The SI unit for angular velocity is the radian per second.

Galileo invented a rudimentary water thermometer in 1593. 

A thermometer is used to measure the temperature.

These days, digital thermometers are used to measure the temperature, as they do not contain mercury.

Fundamental units are the units of the 7 fundamental quantities.

Mass is a measure of the amount of matter in an object, so the mass of an object is constant.

In FPS system, length is measured in foot.

In CGS system, the unit of mass is grams.

Second is a unit of time which is common in FPS, CGS, MKS.