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UNITS AND DIMESIONS - Coggle Diagram
UNITS AND DIMESIONS
UNITS
SUPPLEMENTARY UNITS
Plane angle: radian
Solid angle: steradian
SI UNITS
Electric current: ampere
Temperature: kelvin
Time: s
Amount of substance: mole
Mass: kg
Luminous intensity: candela
Length: m
MEASUREMENT OF LENGTH
For large distances like interstallar distances
Parallax method
Units
Astronomical unit
Light year
Parsec
For miniscule distances like size of a molecule
Lycopodium powder method
Units
Fermi
Angstrom
MEASUREMENT OF MASS
Standard unit: atomic mass unit
SI unit: kilogram
Range of Units: 10^-30 to 10^55 kg
MEASUREMENT OF TIME
SI unit: second
Methods of measurement
cesium clock
atomic clock
ERRORS
TYPES
Random errors
Least count error
Systematic errors
Imperfection in experimental technique
Personal errors
Instrumental errors
TERMS
accuracy
precision
CALCULATION OF ERRORS
Relative Error
mean of absolute errors/mean of errors
Percentage error
(relative error x 100)%
Absolute error
individual measurement - mean of individual measurements
COMBINATION OF ERRORS
Error of sum of Difference
delta Z = delta A + delta B
Error of Product or Quotient
delta Z/Z = delta A/A + delta B/B