A pressure transducer offers the user another important means of measuring the environment. These sensors are typically used to measure the pressure of either gases or liquids. Pressure is, in the most basic sense, the amount of force that is required in order to prevent a fluid or gas from expanding. This measurement is expressed as the amount of force per unit of area. The sensor will generate a signal that expresses the amount of pressure imposed. The most common type of signal used for this purpose is an electrical one. However, sensors that utilize audio or visual signals are also fairly easy to find.

There are numerous applications in which a pressure sensor is used, thousands everyday. Other variables are also measured indirectly via the use of these sensors. Some of these include altitude, fluid/gas flow, water level, and speed. Pressure sensors are known by a number of different names. The phrases pressure transducer, pressure sender, pressure transmitter, and pressure indicator are all additional names used to describe pressure sensors. Over the years, the technology to create these sensors has grown in a number of different directions. Depending on the industry and usage, the cost, performance, and design can all vary quite drastically. It is believed that there are at least three hundred different companies around the world today that are making pressure sensors for use in everything from basic engine cylinders to equipment used in space exploration.

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