1. The problem statement, all variables and given/known data What is the unit of the system-universe temperature variation coefficient? The system is a container holding a mass of water. T The universe I guess is the room temperature. Troom t is time in seconds. [tex]\Psi[/tex] is the temperature variation coefficient. 2. Relevant equations [tex]\Delta[/tex]T / [tex]\Delta[/tex]t = [tex]\Psi[/tex](T - Troom) [tex]\Psi[/tex]t = ln ((To - Troom) / (T - Troom)) 3. The attempt at a solution Since it is temperature over time I thought that it would be degrees per second? But that is angular velocity so I'm sure that's not it.