"Spirit in a bowl evaporates at a rate that is proportional to the surface area of the liquid.
Channel: Doubtnut
Date: 2020-02-16

"Spirit in a bowl evaporates at a rate that is proportional to the surface area of the liquid. Initially, the height of liquid in the bowl is `H_(0)`. It becomes `(H_(0))/(2)` in time `t_(0)`. How much more time will be needed for the height of liquid to 
 become `(H_(0))/(4)`"