Question

1. why should you never determine the mass of a hot object?
2. why is it necessary to calibrate a thermometer and volumetric glassware?

Explanation:

8.

A hot object can cause damage to weighing equipment like a balance. Also, hot air currents around the object can lead to inaccurate mass - readings.

Thermometers and volumetric glassware may have manufacturing defects or may change over time. Calibration ensures accurate temperature and volume measurements respectively.

Answer:

It can damage weighing equipment and cause inaccurate readings due to hot air currents.

9.