Which occurs when a warm fluid cools down? ... The density of the fluid decreases.

What does a fluid do when it becomes hot?

When a liquid or gas is heated, the molecules move faster, bump into each other, and spread apart. ... The opposite occurs when a liquid or gas is cooled. The molecules move more slowly and take up less space. Therefore temperature can affect density.

What is conduction process?

Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules. ... Conduction occurs more readily in solids and liquids, where the particles are closer to together, than in gases, where particles are further apart.

What is conduction convection and radiation?

Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.

What is convection energy source?

Convection is the motion of a fluid driven by temperature differences across that fluid. When a fluid is heated, the region in closest contact with the heat source becomes less dense due to increased kinetic energy in the particles. The others are thermal conduction, radiant energy and evapotranspiration. ...

Warm Up and Cool Down in Dance Practice by Laura Stanyer

20 related questions found

Does thermal energy Mean heat?

Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy.

What is fossil fuel oil?

Fossil fuels are made from decomposing plants and animals. These fuels are found in the Earth's crust and contain carbon and hydrogen, which can be burned for energy. Coal, oil, and natural gas are examples of fossil fuels.

How do convection occur?

How does convection work? Convection works by areas of a liquid or gas heating or cooling greater than their surroundings, causing differences in temperature. These temperature differences then cause the areas to move as the hotter, less dense areas rise, and the cooler, more dense areas sink.

How does the heat conduction differ from convection?

In conduction, heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. ... The heat transfer takes place due to the difference in temperature.

Which is an example of heat transfer by conduction?

A common example of conduction is the process of heating a pan on a stove. The heat from the burner transfers directly to the surface of the pan. Temperature is a measure of the amount of kinetic energy processed by the particles in a sample of matter.

Is heat transferred by radiation?

A final method of heat transfer involves radiation. Radiation is the transfer of heat by means of electromagnetic waves. ... All objects radiate energy in the form of electromagnetic waves. The rate at which this energy is released is proportional to the Kelvin temperature (T) raised to the fourth power.

How is convection heat transferred?

Convective heat transfer is the transfer of heat between two bodies by currents of moving gas or fluid. In free convection, air or water moves away from the heated body as the warm air or water rises and is replaced by a cooler parcel of air or water.

How does conduction of heat occur?

Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them. This then continues and passes the energy from the hot end down to the colder end of the substance.

Why does the temperature of the liquid decrease?

Since the kinetic energy of a molecule is proportional to its temperature, evaporation proceeds more quickly at higher temperatures. As the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid decreases.

What type of heat transfer occurs in fluids?

When the object is a fluid, heat can be transferred from the fluid to another object by flow of the fluid on the surface of the object. This type of heat transfer is called convection. Convection can transfer larger amounts of heat than conduction.

Do warm fluids rise?

Explanation: When fluids (liquids and gases) are heated, they expand and therefore become less dense. Any object or substance that is less dense than a fluid will float in that fluid, so hot water rises (floats) in colder water.

How is heat loss different between conduction and convection quizlet?

Terms in this set (10)

What is the difference between conduction and convection? Conduction is the transfer of heat by direct contact; requires a solid. Convection is the transfer of heat in a fluid; can be a liquid or a gas. ... We can use the sun to heat things.

Which is faster conduction or convection?

The molecules of a hotter material move faster and therefore have higher kinetic energy than the molecules of a cooler material. Convection can be many times faster than conduction alone. ...

What is difference between conductor and insulator?

A conductor allows current to flow easily through it. An Insulator doesn't allow current to flow through it. Electric charge exists on the surface of conductors. Electric charges are absent in insulators.

What type of heat transfer occurs when the warm ocean water meets the cold ocean water?

Convection currents move thermal energy through many fluids, including molten rock inside Earth, water in the oceans, and air in the atmosphere.

Why does convection occur in heated liquids?

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. ... Liquids and gases expand when they are heated. This is because the particles in liquids and gases move faster when they are heated than they do when they are cold.

What happens to the cooler water?

Convection currents are set up in the fluid because the hotter part of the fluid is not as dense as the cooler part, so there is an upward buoyant force on the hotter fluid, making it rise while the cooler, denser, fluid sinks.

Is oil really from dinosaurs?

Oil and natural gas do not come from fossilized dinosaurs! Thus, they are not fossil fuels. That's a myth. ... sponsored a dinosaur at the Chicago World's Fair “on the premise that the world's oil reserves were formed during the Mesozoic era, when the dinosaurs lived.

What is coal made of?

Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity. It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning).

Are fossil fuels dinosaurs?

Sadly, fossil fuels are not made of dinosaurs. They are made from long-dead organic matter that was buried beneath the ground, yes. This was the original definition of a fossil, rather than being applied specifically to the bones of ancient beasties.