Liquid glass thermometers measure?

Liquid glass thermometers are designed to measure low temperatures effectively due to the type of liquid contained within them, typically mercury or colored alcohol. These liquids expand and contract uniformly with temperature changes, allowing for accurate readings at lower temperatures. While they can certainly measure a range of temperatures, there are limits to their effectiveness; for example, mercury thermometers perform poorly in extremely low temperatures and could freeze, while alcohol-based thermometers are generally more suitable for low-temperature applications.

In this context, the designation of liquid glass thermometers as primarily measuring "low temperatures" is appropriate as they are particularly valued for their sensitivity and accuracy in such ranges. Their design is suited to monitor conditions that would be encountered in various operational scenarios, especially where lower temperature readings are critical.