quote: These materials are relatively expensive due to scarcity and lack of a large manufacturing infrastructure. They are also bulky and require more material, which further increaese their cost.
quote: Second paragraph -A thermoelectric device has two __ basic modes of operation.(two spaces between the words two and basic).
quote: Third paragraph -further increaese their cost. increases
quote: Sixth paragraph -heat conduction of silicon is reduced to one hundreth of its normal levels.hundredth