OCR A PHYSICS FROM 2015

   Base units and quantities

• A physical quantity is a property of an object or of a phenomenon that can be measured

• The 7 SI base units are-
• length, m
• mass, kg
• time, s
• electric current, A
• temperature, K
• amount of sunstance, mol
• luminous intensity, cd

The prefixes are:

• peta, P, 10 to the power of 15
• tera, T, 10 to the power of 12
• giga, G, 10 to the power of 9
• mega, M, 10 to the power of 6
• kilo, k, 10 to the power of 3
• deci, d, 10 to the power of -1
• centi,c, 10 to the power of -2
• milli, m, 10 to the power of -3
• …