The temperature dropped from 75 degrees to 50 degrees. What was the percent decrease in the temperature?
Percentage is a fraction where the bottom number (denominator) is fixed at 100.
We need to change
Let the unknown value be
Find some way to convert 75 into 100, do the same thing to the 25 and we have our answer.
If we divide 75 by 75 we have 1. Then if we multiply the 1 by 100 we have our 100
Do the same thing to the top (numerator)
It is notcorrect to talk about percent of temperature in an arbritary scale like the centrigrade scale.
The only meaningfull is the absolute scale.
So 75 °C corresponds to 75+273.15=348.15K,
and 50°C corressponds to 50+273.15=323.15K.
The percental decrease will be
In close vessel taking the law: