Mechanical Engineering Units

THEORY OF MACHINES

TermsUnits
FrequenyHz or Cycles / s
Gyroscopic coupleN-m
Modulemm / teeth
Pitchmm
Addendum / dedendummm
Length of path of approach mm
Length of arc of contactmm

MACHINE DESIGN

TermsUnits
Yield strengthN / m2
Ultimate strengthN / m2
ToughnessN / m2
Endurance limitN / m2

Prefixes used with units

Prefix NamePrefix SymbolPrefix Value
yoctoy10-24
zeptoz10-21
attoa10-18
femtof10-15
picop10-12
nanon10-9
microµ10-6
millim10-3
centic10-2
decid10-1
  100
decada101
hectoh102
kilok103
megaM106
gigaG109
teraT1012
petaP1015
exaE1018
zettaZ1021
yottaY1024

Example :

Youngs Modulus of Mild Steel= 210 Gpa -> -> 210 x 109 N/m2

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