Why did the available size of my macbook air decrease all of a sudden?

last night i removed some apps to increase my disk size..everything was fine.but today when i opened my macbook air.the size decreased from 21.52GB to 11.05GB.why is that?

OmniDisk can help you find file and folder sizes...
http://www.macupdate.com/app/mac/7402/omnidisksweeper
Freeing Up Hard Disk Space - Mac Guides

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