A person can often hear a sound from farther away better when the temperature is colder outside.
In gases like air, sound travels via collisions with the molecules; sound travels faster in gases when the temperature is increased (and the density is held constant).
Sound travels faster in air as the temperature increases.
The speed of sound depends on the phase of the material (solid, liquid, or gas). In general, sound travels fastest in solids, then liquids, then gases.
If the wavelength of visible light was as large as that of a sound wave you’d be able to see around corners.
A sound wave will often travel from one room to another spreading out though an adjacent doorway where it’s then heard. This is an example of the wave property known as diffraction.
