Water Convection

How ocean currents formed?

• Gravity

• Wind

• Earthquakes

• Flood

Why the hot water stay above and not below?

• Higher temperature causes water to have lower density.

• Higher temperature causes water to have higher density

• Higher temperature don't have density

• Higher temperature have the same density as lower temperature

Convection happens only in

• Cells

• Solids

• Fluids

• All of the above

Hot fluids are less dense than cold fluids

• True

• False

Convection is not an unique characteristics of water.

• False

• True

What is the definition of convection?

• The 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.

• 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.

• The emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.

In which of the following processes, convection does not take place primarily?

• Sea and land breeze

• Boiling of water

• Heating air around a furnace

• Warming of glass of bulb due to filament

Which of the following is an example of convection?

• The heat of the sun warming our planet

• An overhead fan cooling a room

• Ice cubes cooling a drink

• A microwave oven cooking a meal

The process of convection can takes place only in liquid and gases.

• True

• False

Most of the heat transfer that is taking place on the earth is by Radiation.

• True

• False