Different design features are chosen to give the thermometer specific characteristics. Match each characteristic below with the correct design modification that achieves it:

Characteristics:

1. High sensitivity
2. Wide temperature range
3. Quick speed of response

Design Modifications:

• A. Using a liquid with a very low melting point and a very high boiling point.
• B. Designing the bulb with a very thin glass wall.
• C. Using a large bulb combined with a capillary tube of very narrow bore.
• D. Using a thick-walled capillary tube to magnify the liquid thread.

Describe the design of a clinical thermometer, highlighting how its structure differs from a standard laboratory thermometer. Specifically identify the structural feature that allows it to retain its maximum reading.

Explain why a clinical thermometer is designed with:

1. a constriction in the capillary tube just above the bulb,
2. a bulb with a very thin glass wall.