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.
Trees are a renewable resource. Most alternative materials come from nonrenewable resources, such as the petrochemicals used in making plastics and the ores used to make aluminum, iron and other metals. Wood is also the most energy-efficient building material available today.