File size dilemma

Dear All,
I took some shots yesterday with my iPod Touch Fifth Geration and Adobe Bridge (of just by clicking on the file in Finder) shows the file size of the jpeg files at about 2.33 megs with dimensions of 1936 x 2592 or 26.9 x 36.0, 72 ppi.  When I open the file in Adobe Photoshop CC, the file size is 14.4 megs with the same dimensions. 
Why is there such a difference in file size?  Thanks.
And, after I work on the file in Photoshop and save it again AS A TIFF IMAGE without changing dimensions, but doing some work with NIK filters, Adobe Bridge now shows the new file at 14.39 megs.  I know that TIFF takes up more file size than jpeg, but is there that much of a difference in file size?
Small Town Gal

The file captured by you phone is a compressed jpg file.  When you open it in Photoshop, it is reverted to it's full uncompressed size.  Same thing with saving it as a tif file: a tif file is not compressed like a jpg.

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