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Index (Y)

YA - YC

YD - YF

YG - YJ

YK - YN

YO - YR

YS - YV

YW - YZ

Moment of truth
More than 25 million people died in Europe from the bubonic plague (the black death) in five years, from 1347 to 1352.


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Young's modulus Eng.
A measure of mechanical strength or elasticity of a material with a usual symbol of E and defined as a ratio of stress/strain. The stress can be either tensile or compressive depends on the material being stretched or compressed. It is also known as the elastic modulus. The unit is in Pascal, Pa (or Nm-2). For example, for soda-lime glass, E = 69 GPa and for iron, E = 196 GPa.

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