Temperature is a measure of thermal energy. Like, how hot or cold something is. When testing a temperature, you would use a <em>thermometer</em>. A thermometer measures how hot or cold something is.
Hope this helps. :)
        
             
        
        
        
It decreases since a air less balloon is heavier than a Aired balloon
        
             
        
        
        
Idk if i'm too late but the answer should be A.