Question

Complete the following: The lid of a calorimeter minimises heat loss by __________.

• A. convection
• B. radiation

Hint:

In a calorimeter: The vacuum flask design minimizes conduction and convection. The silvered surfaces minimize radiation. The lid primarily stops convection.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Heat loss from a container can occur via conduction, convection, and radiation. A calorimeter is designed to isolate the system thermally.
Step 2: Detailed Explanation:
Convection involves the physical movement of fluid (like air). When a calorimeter is open, hot air above the substance rises and is replaced by cooler air, carrying heat away.
By placing a lid, we trap the air and prevent this continuous circulation of air currents.
Radiation loss is minimized by polishing or silvering the inner and outer surfaces of the calorimeter, not primarily by the lid.
Step 3: Final Answer:
The lid minimises heat loss by convection.