Heat Transfer Through Fluid Movement: Convection
Heat can be transferred in three primary ways: conduction, convection, and radiation.
- Conduction: This is heat transfer through direct physical contact, primarily in solids. Energy is passed from particle to particle without the particles themselves moving long distances.
- Convection: This method involves heat transfer through the movement of fluids (liquids or gases). When a part of a fluid is heated, it becomes less dense and rises, while cooler, denser fluid sinks, creating a cycle that distributes heat. This directly matches the question's description.
- Radiation: This is heat transfer through electromagnetic waves, like infrared radiation from the sun or a fire. It does not require a medium.
- Reflection: This is the bouncing back of waves or particles off a surface. It's related to how objects interact with radiation but isn't a method of heat transfer itself.
Therefore, the concept that explains heat transfer specifically through the movement of fluids (liquids or gases) is convection.
Important Questions from Physics
What is the colour of the light emitted by the Sun?
Lightning occur in the sky when two clouds:
With reference to street-lighting, how do sodium lamps differ from LED lamps?
1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.
2. As street lights, sodium lamps have a longer life span than LED lamps.
3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting.
Select the correct answer using the code given below.
Which one of the following is a reason why astronomical distances are measured in light-years?
In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?
1. Area of the hole in the lid
2. Temperature of the flame
3. Weight of the lid
Select the correct answer using the code given below.
