9.2 Heat Flow and Thermal Equilibrium

Heat flows from a hot object to a cold object

Radiation

Convection

Conduction

Heat is transferred by the movement of liquid

Heat transfer from hotter regions to colder regions through a SOLID MEDIUM

The part of the liquid that receives heat will expand become less dense and rise

Particles that receive heat energy will VIBRATE and
COLLIDE with one another more frequently and transfer the heat to the whole medium

it's a process of transferring heat without any medium.

propagate through an empty space or vacuum.

The colder and more dense fluid moves downwards

The circulating stream that rises and falls continuously is known as convection current

Types of surface, temperature and total surface area of an object.

Heat Flow in Natural Phenomena

Heat Conductors

Heat insulators

Thermal insulation is the reduction of heat transfer between objects in thermal contact or in range of radiative influence.

roof-heat-insulation-materials-500x500

Natural Convection Heat Transfer from a Rectangular Block Embedded in a Vertical Enclosure.

Good Conductors

Pure Silver, Pure copper, Pure gold, Aluminium, Zinc, Nickel, Brass, Bronze, Iron, Platinum,Steel,Lead,Stainless steel

Heat conduction (or thermal conduction) is the movement of heat from one solid to another one that has different temperature when they are touching each other.

Thermal Equilibrium

Two objects which are in thermal contact can exchange heat energy between them.

The heat energy is transferred from the object with a higher temperature to the object with a lower temperature