[P5.7, P7.6]
of: a material (solid, liquid or gas)
is: an elastic modulus, conventionally denoted [P5.7, P7.6]
is defined: as the ratio of the applied volume stress 
to the resulting volume strain 
(note the 
sign) [P5.7]
has as its SI unit: 
or Pa (i.e. pascal). [P5.7, P7.6]
Copyright 1997, The Open University