A floor that feels solid may still be moving. Vibrations travel through the ground and across buildings, often at levels too small for people to notice. Most have little effect on everyday activities, but in some research laboratories, instruments measuring matter at the nanoscale can register movements this small, and even traffic several miles away can interfere with an experiment.
Other experiments place different demands on the spaces around them. Equipment and the ducts and services above it often need more height than a conventional floor provides. Certain processes require continuous ventilation, while equipment generates heat that must be removed. The systems supporting this work occupy space of their own, and some of them produce the very vibrations that sensitive experiments need to avoid.
