A RECENT communication 1 discusses the freeze-drying process as conducted with the pressure of permanent gas, and the vapour pressure of the ice on the condenser, maintained at very low levels.

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Chemical Engineering is concerned with the design and operation of processes which convert materials and energy into the higher value products we use every day. It understands the processes which ...

Supreme Court Lets Trump Enforce Transgender Troop Ban as Cases Proceed Lower courts had blocked President Trump’s policy, saying it was not supported by evidence and violated equal protection ...