Question 8 (1 point)
Convection ovens are ovens that are advertised to cook food more evenly than a standard thermal oven. Which statement best explains how a convection oven works?
a
Hot air is transferred through heat being radiated from a thermal burner.
b
Hot air is transferred through molecule to molecule contact.
c
Hot air is transferred through density differences with cool air rising and hot air sinking.
d
Hot air is transferred through density differences with hot air rising and cool air sinking.
d
Hot air is transferred through density differences with hot air rising and cool air sinking.
d. Hot air is transferred through density differences with hot air rising and cool air sinking.
To find the answer to this question, we need to understand how convection ovens work. A convection oven uses a fan and exhaust system to circulate hot air in the oven during cooking. This circulation of hot air helps to cook food more evenly and quickly compared to a standard thermal oven.
Now let's analyze each statement to see which one best explains how a convection oven works:
a) Hot air is transferred through heat being radiated from a thermal burner.
This statement is not accurate because convection ovens do not rely on heat from a thermal burner. Instead, they use a fan system to circulate hot air.
b) Hot air is transferred through molecule to molecule contact.
While molecule to molecule contact does play a role in heat transfer, it does not solely explain how a convection oven works. The fan in a convection oven is responsible for circulating the hot air, rather than relying on direct contact between molecules.
c) Hot air is transferred through density differences with cool air rising and hot air sinking.
This statement is incorrect because it describes natural convection, which occurs when there is a temperature difference in a fluid or gas. Convection ovens, however, use forced convection where a fan actively circulates the hot air, regardless of temperature differences.
d) Hot air is transferred through density differences with hot air rising and cool air sinking.
This statement accurately describes how a convection oven works. The fan in the oven helps in creating a constant circulation pattern, where hot air rises and cool air sinks. This helps in distributing the heat evenly throughout the oven and cooking the food more efficiently.
Therefore, the correct answer is d) Hot air is transferred through density differences with hot air rising and cool air sinking.