Which term refers to the method of measuring very small objects?

The term that refers to the method of measuring very small objects is microscopy. This technique involves the use of microscopes, which are instruments designed to magnify small specimens, allowing scientists to observe and measure structures that are too small to be seen with the naked eye. Microscopy can reveal details at the cellular level or even smaller, making it essential for fields such as biology, materials science, and nanotechnology.

Calibration involves adjusting instruments to ensure their accuracy but does not specifically relate to measuring the small size of objects. Observation refers to the act of noting and recording phenomena, which can be done without specialized tools, and quantification refers to the process of measuring and expressing a quantity, but it does not imply the methodology necessary for examining extremely small items. Therefore, microscopy is the most appropriate choice when discussing methods specifically aimed at measuring very small objects.