Higher particle speed typically indicates a higher temperature. In a gas or fluid, temperature is a measure of the average kinetic energy of the particles. When the particles move faster, it means they have higher kinetic energy, which corresponds to an increase in temperature.
In thermodynamics, this relationship can be described by the kinetic theory of gases, which states that the temperature (T) is directly proportional to the average kinetic energy (KE) of the particles in a system. The equation relating temperature and kinetic energy is given by:
\[ KE = \frac{3}{2} k T \]
where \( k \) is the Boltzmann constant. This implies that as particle speed increases, the temperature of the substance increases as well.