Dhund is a 1973 Hindi movie produced and directed by B. R. Chopra. The film is based on Agatha Christie's play, The Unexpected Guest, and stars Sanjay Khan, his then flame Zeenat Aman, Danny Denzongpa, Deven Verma, Madan Puri, Navin Nischol and Ashok Kumar.
The heat equation is a parabolic partial differential equation that describes the distribution of heat (or variation in temperature) in a given region over time.
Temperature is an intensive variable of state, meaning that the temperature can be the same for a small volume or a large volume. Heat causes changes in temperature, and heat flows from high temperature to cold temperature. This is the zeroth law of thermodynamics. That is, it is the most fundamental law about heat.