Convection

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/convection

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. How big is Convection?Turbulent convection, multiphase convection, astrophysical convection, computational modeling
2. What is the governing principles?Thermodynamics, fluid dynamics, buoyancy
3. What is the key dimensionless numbers?Rayleigh number (Ra), Reynolds number (Re), Nusselt number (Nu)
4. How does hot air rise and cool air sink?Warm fluid becomes less dense and floats upward, while cooler fluid is denser and falls. This movement pushes heat from hot places to cooler ones, making the whole system warmer over time.
5. What is the difference between natural and forced convection?Natural convection happens because of temperature differences alone, like steam rising from a pot. Forced convection uses something like a fan or pump to push the fluid, speeding up the heat transfer.

Buoyancy: The upward force exerted by a fluid that opposes the weight of an immersed object.
Convection Current: A circulating flow of fluid resulting from density differences caused by temperature gradients.
Dimensionless Numbers: Ratios of physical quantities used to characterize fluid flow and heat transfer phenomena.