Three 2 V cells are connected in series and used as a battery in a circuit. What is the potential difference at the terminals of the battery?

The caloric theory replaced which older theory of heat and combustion?

​If the pressure of a gas is increased by two-fold at a constant volume, the work done by the gas will be _____.

​Which type of wall is present in the closed system?​

Food is cooked in a pressure cooker quickly because

The 3rd step of the Carnot cycle is: