the initial temperature is , T1 = 25 degree celcius
the final temperature is, T2 = 73 farenheit
change 73 degree farenheit into celcius,
C = (F - 32)/1.8e
here F is the temp. in farenheit
C = (73 - 32)/ 1.8
C = 41/1.8
C = 22.8 degree celcius.
so T2 = 22.8 degree celcius
so the change is the temperature is
T1 - T2 = 25 - 22.8
= 2.2 degrees Celcius
thus, the drop in temperature is 2.2 degrees Celcius