In the very early eighteenth century Daniel Fahrenheit figured out that if he encased alcohol in glass tube it would expand at a predictable rate based on the temperature of the environment. This was the first time we were able to measure and calculate temperature changes. While Fahrenheit developed a consistent procedure for measuring temperature, Anders Celsius developed a more practical scale based on the phase changes of water.

Thermometers are instruments that are used to measure the temperature of something, especially a body. When someone is feverish, the thing that measures how much temperature an individual has is known as thermometer. Commonly, thermometers are made from a glass bulb connected to a tube of glass with a numbered scale written on the outside. Inside the glass tube, there is a liquid like mercury or colored alcohol. This colored alcohol rises and falls in the tube as the temperature around it warms or cools. When the temperature rises, the liquid in the glass tube warms up and molecules expand, which in turn takes up more space in the tube. Usually, thermometers have two temperature scales: Fahrenheit and Celsius. Each scale is divided in two-degree increments. Reading the thermometer is not difficult. When you read it, it should be vertical and your eyes should be level with the top of the liquid in the glass tube. With the scale, you'll know how much temperature the body has! These worksheets explain how to read thermometer measurements in both Celsius and Fahrenheit. Scales are presented as tic marks between whole numbers. All answers are in whole numbers.