P.2 E.S Thermal Energy Transfer

Why is conduction less likely to happen in a gas?

The molecules are usually further apart, giving a lower chance of molecules colliding and passing on heat energy.

Cold rises up. True or false

False

How thermal energy is transferred?

Heat may be transferred by means of conduction, convection, or radiation. Conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. Collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object.

Energy always moves from...

High to low

Temperature-

Is the measurement of how fast mol uses move.

How is energy transferred through radiation?

It can be transferred from one place to another by conduction, convection and radiation. Conduction and convection involve particles, but radiation involves electromagnetic waves. Conduction. Heat energy can move through a substance by conduction.

What is the unit for thermal energy?

On the gas bill energy is measured in therms. A therm is 100,000 British Thermal Units (BTU). This unit is defined in terms of heating something, instead of lifting it; this is how there came to be another unit in the first place. The BTU is 1055 Joules, and so a therm is 105,500,000 Joules.

When does heat transfer happen

The fundamental modes of heat transfer are conduction or diffusion, convection and radiation. Heat transfer always occurs from a region of high temperature to another region of lower temperature. Heat transfer changes the internal energy of both systems involved according to the First Law of Thermodynamics.

How does convection current work in a pot of boiling water?

The heat source is the burner and the water at the bottom of the pot is the hottest and will rise to the top of the pot and the coolest water molecules will sink. This creates cirulation

What is a measure of thermal energy?

The hotter the substance, the more its molecules vibrate, and the therefore the higher its thermal energy. We cannot discuss thermal energy without touching on Temperature. Heat and Temperature are not the same thing. The temperature of an object is to do with how hot or cold it is, measured in degrees Celsius (°C).

What has greater thermal energy, a pot of boiling water or an iceberg? why?

The iceberg because it has a bigger mass, so therefore it will have more molecules that are moving.

Hen particles have more heat,

The particles move more quickly

What has greater temperature, a boiling pot of water or an iceberg?

The pot of boiling water because it has faster moving particles.

Name 2 examples of radiation?

The sun on your skin, warmth of the fire

What is thermal energy?

Thermal energy is the energy that comes from heat. This heat is generated by the movement of tiny particles within an object. The faster these particles move, the more heat is generated.

What is transpiration?

Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. Transpiration is essentially evaporation of water from plant leaves.

Cool air sinks. True or false

True

Heat rises up. True or false

True

Warm air rises. True or false

True

What is heat transfer?

What are the three main types of heat transfer?

Name two examples of conduction

Your hand touching a hot dish. You burn your hand.

What is conduction?

he process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.

What is the water cycle?

the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow, drainage in streams and rivers, and return to the atmosphere by evaporation and transpiration.

What is radiation?

the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles that cause ionization.

What is convection?

the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat