If a substance is measured as having a change in heat energy of -100 joules, what does that mean.

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

1. they vary with a higher number because boiling is way hotter than melting