Can you help me with my portable air conditioner ?

I bought a portable air conditioner but it came with this as you see in the pictures that I need to put water inside and attach it to my portable air conditioner but why ? I have a 12000 btu portable air conditioner . http://tinypic.com/r/11j9b9u/9 http://tinypic.com/r/2eqgynq/9

submitted by /u/yafatana
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