Though there are times that the two of them can be used interchangably, there are some particular usages that only one fits into. The following sentence is a good example of what I said: The compressed gas is cooled and condenses into a liquid... In talking about reducing the size, compress means to press or squeeze something, whereas condense doesn't imply the pressure.
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LanguageLoverIn this example compress means to force the volume of the gas to a smaller volume and condense means to change it's state,
The compressed gas is cooled and condenses into a liquid...