Is there a formula to measure this?
If you know please share, thanks.
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
See these websites:
http://en.wikipedia.org/wiki/Young's_modulus (not really useful...)
Image from "Young's Modulus (Objective) : Physical sciences : Physical Sciences : IIIT Hyderabad Virtual Lab ." IIIT Hyderabad Virtual Lab . N.p., n.d. Web. 24 Oct. 2012. http://iiith.vlab.co.in/?sub=19&brch=45&sim=544&cnt=914.