Milk turns into curd, and curd does not turn back into milk
Milk turns into curd, and curd does not turn back into milk. Gaurav says this must mean curd-forming cannot be a physical change — physical changes can always be reversed. Is Gaurav's reasoning right?
Want to know who's right, and why? Reason it out yourself — free, in Hindi, Hinglish or English.
Start thinking on Socho →More disagreements in Changes Around Us: Physical and Chemical
A candle's solid wax melts into liquid and then cools back into solidAdding a few drops of food colouring to a glass of water turns the water pinkAn iron rod is cut with a saw, and an identical rod is left out in the rain until it rustsSalt dissolves in water and disappears completelyTanya says fast changes are chemical and slow ones are physical — so iron rusting (slow) i