Why does the temperature of a substance during a phase change stay constant, despite heat being transferred?
During a phase change, a substance receives or gives away heat. However, the temperature stays constant, since the energy is not used to increase the kinetic energy of the constituent molecules of the substance. The heat received (or given away) is used to break up (or form) the bonds between the molecules, in order to change the substance's thermodynamic state/phase.
LL
Related Physics IB answers
All answers ▸Distinguish between internal energy and temperature
When a hailstone of 0 C falls towards the earth, the kinetic energy of the hailstone is transferred to thermal energy in the ice. What is the minimum speed so that it just melts when it hits the surface. The latent heat of fusion of ice is 340 kJ/kg.
Use the idea of a thermos flask to explain conduction, convection and radiation. Comment also how a thermos flask can reduce heat loss.
Based on Newton's 3 laws of motion why is linear momentum always conserved?