The diagram illustrates a liquid-in-glass thermometer. A student wants to verify the position of the upper fixed point on this thermometer. What ought she to do?
- APut the bulb in a beaker of boiling sea water.
- BPut the bulb in a beaker of boiling pure water.
- CPut the bulb in a beaker of ice and salt.
- DPut the bulb in a beaker of pure melting ice.