There is more than one way to heat water, so I would not apply this to all situations, but in general, when you heat water you create convection currents which cause the hotter water to mix in with the colder water.
Convection
Conduction is the way in which heat travels through solids
convection
It's Radiation
radiant heat
convection
Convection
Heat travels through water and air primarily through conduction and convection. Radiation is also a significant means of heat transfer through air, but less so through water.
radiation, this is the only one that travels in a vacuum
How fast heat travels depends upon which method it uses to travel (conduction/ convection/radiation) and what it is travelling through (metal/air/water etc.). heat travels much more quickly through metal because metals are good thermal conductors.
Capillarity
Sound doesn't travel in heat. It travels in a physical medium.
Convection :D
Conduction is the way in which heat travels through solids
Yes, when heat travels by convection the energy is transferred by the circulation of a heated fluid, such as air or water.
Heat travels in all of these ways.
convection