what is the cost of piezoeletric crystals of 100nm thickness?

using water as coolant in automobiles makes the vehicle bulky and decreases the efficiency.don't we have an alternative for water?can we use some specific derivative of methane in place of...

can an automobile work without a cooling system?

could anybody plz tell me wat is d problem wid 6-strokes engine??? why is it taking so much time to come to the market???