The fixture for the small pycnometer is weighed together with the pycnometer.

• A. Not Given
• B. True
• C. False
• D. Not Applicable

Answer: (B)

When measuring density with a pycnometer, you must use the whole assembly that will interact with the liquid—the pycnometer plus its fixture. The fixture contributes both mass and a defined volume, so weighing them together gives you the correct total mass for the known total volume. This ensures the density or specific gravity calculation is based on the actual volume being measured. If the fixture were weighed separately, you would introduce a mismatch between mass and the volume used in the calculation, leading to error. Therefore, weighing the fixture with the pycnometer is the proper practice.