We measure some physical or nonphysical quantity by the mean of some output results. This output results express in some units. For example we usually measure length in millimeter or meter or kilometer.
But in a standard manner, every individual type of measurement express in unique fundamental unit. According to SI standard,we have seven basic fundamental units of seven basic measurement type. This type is expressed follows
1. Mass –
The basic fundamental unit of mass is “Kg”. We also measure mass in Gram, Pound, Metric ton, Stone, Micro gram, Carat etc. Some basic relation between units are
Relation between Units of Mass 

1 centigrams (cg) 
10 milligrams (mg) 
100 milligrams 
10 centigrams 
1 decigrams (dg) 
10 centigrams 
10 decigrams 
1 gram (g) 
1000 milligrams 
10 decigrams 
1 dekagrams (dag) 
10 grams 
10 dekagrams 
100 grams 
10 dekagrams 
1 hectogram (hg) 
10 hectograms 
1 kilogram (kg) 
10 hectograms 
1000 grams 
2. Time –
The basic fundamental unit of Time is “Sec(s)”. We also express time in seconds, minutes, hours, days, weeks,years etc. Some basic relation between units are
Relation between Units of Time 

1 minute 
60 seconds 
1 Hour 
60 minutes or 3600 seconds 
1 Day 
24 Hours or 86,400 seconds 
1 Week 
7 days, or 604,800 seconds 
3. Electric Current –
The basic fundamental unit of Electric Current is “Ampere(A)”. Some basic Electrical & electronic units are –
Electrical & Electronic Units 

Electric current (I) 
Ampere(A) 
Volt (V) 
Voltage (V) 
Ohm (Ω) 
Resistance (R) 
Watt 
Electric power (P) 
4. Amount of Substance –
Amount of Substance is a dimensionless expression of the number of particles in a particle or object. The basic fundamental unit of Amount of Substance is “Mole”. Amount of substance all called material quantity.
5. Illumination
The SI unit of Illumination is “Candela”. Candela is denoted by symbol ‘cd’. Some other units is lux, lumen etc.
6. Distance
The SI unit of Distance is “Meter”. Distance also measure in mm, cm, km, yard,inch, foot,feet etc. The relation between Units of Distance is listed below
Relation between Units of Distance 

1 centimeter 
10 millimeters 
1 meter 
100 centimeters or 1,000 millimeters 
1 kilometer 
1,000 meters 
1 inch 
2.54 centimeters or 25.4 millimeters 
1 foot 
30.48 centimeters or 12 inches 
1 yard 
0.91 meters or 3 feet 
1 mile 
1.6 kilometers 
7. Temperature
The SI unit of temperature is “kelvin”, expressed as word “K”.The temperature 0 K is known as “absolute zero.”
We use two types of scale in measuring temperature that is –
1.Relative scales [Fahrenheit (°F) and Celsius (°C)]
2. Absolute scales [Rankine (°R) and Kelvin (K)].
The relation between above two is described by follow relations –
F = 1.8C + 32
C = (F32)/1.8
R= F+ 460
K=C + 273
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