At night ,a balloon was full of air and was able to float ,but , at morning the balloon got small and had less air compared to last night , also it was not able to float.WHY??

Dear student,
Please find below the answer:

The balloons become small and lose air gradually because the balloons are not completely airtight. The air particles inside the balloon slowly diffuse through walls of the balloon or knot. Due to the high pressure inside the balloon, the flux is operating outside. It slowly reduces and after a week all air goes out of the balloon.  

Hope this clears your doubt.

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