Si System

Question 1

What is the SI system

Answer 1

The SI system (International System of Units) is the modern metric system of measurement

Question 2

List the the SI base Units

Answer 2

Quantity Name of Unit Symbol
Length meter m
Mass kilogram kg
Time second s
Electrical current ampere A
Thermodynamic temperature Kelvin K
Luminous intensity candela cd
Amount of substance mole mol

Question 3

Define SI base units

Answer 3

The core of the SI system is a short list of base units defined in an absolute way without referring to any other units

Question 4

Define the SI derived units

Answer 4

Derived units are algebraic combinations of the seven base units and the two supplementary units
they are derived from base units
eg area = meter squared ….base unit is metre

Question 5

List 7 SI Derived units

Answer 5

Force Newton N 
Work, energy, heat joule J 
Electrical resistance ohm w 
Pressure pascal Pa 
Frequency hertz Hz 
Plane angle radian rad 
Solid angle steradian sr 
area m2
volume m3

Question 6

Formula for Mass

Answer 6

Mass = Density X Volume