As water pressure changes, the volume of air in a bladder. pressure tank contracts and expands. Periodically, the amount. of air in the tank should be measured and the tank recharged if. the air is too low. Bladder pressure tanks do not provide any. useful water storage capacity.
Add Image. Exotic Materials are the strange and unusual elements produced by science, nature, or some strange alien force. Such materials could be alloys, isotopes, chemicals, and such.
1 A stiff material has a high Young's modulus and changes its shape only slightly under elastic loads (e.g. diamond). 2  A flexible material has a low Young's modulus and changes its shape considerably (e.g. rubbers). A flexible material has a low Young's modulus and changes its shape considerably (e.g. rubbers). 2  A stiff material requires high loads to elastically deform it-not to be confused with a strong material, which requires high loads to permanently deform (or break) it.