Thermometer — Full

Reliable for adults and children who can hold the device correctly, notes MedlinePlus .

Infrared thermometers calculate temperature by measuring the thermal radiation emitted by an object. These are commonly used for rapid surface or forehead measurements, as they do not require contact with the object being measured. Common Types of Thermometers thermometer

Used by meteorologists to track weather and in households for ambient temperature. Reliable for adults and children who can hold

These scan the temple to detect the temperature of the temporal artery. They are non-invasive and excellent for screening, though they may require more precise reading with a traditional thermometer if a high fever is suspected. Common Types of Thermometers Used by meteorologists to

The thermometer is a fundamental tool that has allowed humanity to quantify heat, from measuring the warmth of a child to monitoring industrial processes. Simply defined, a thermometer is an instrument designed to measure the temperature of solids, liquids, or gases, or to determine the temperature gradient between two points. It works by identifying a change in the physical properties of a sensor, such as liquid expansion or electrical resistance, and converting that change into a numerical value. The Evolution of Measuring Heat: A Brief History