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Pdfcompress is a mac os x utility for reducing the size of pdf files. Thermodynamics is not concerned about how and at what rate these energy transformations are carried out, but is based on initial and final states of a system undergoing the change. Select a compressing option, its recommended to try the medium compressing at first, you can try other options if the file size is not small enough. Depending on what data is contained in the pdf, the compression works well or less well.
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