Steam gauges used in boiler systems are typically calibrated in which unit?

Steam gauges used in boiler systems are typically calibrated in pounds per square inch (psi) because this unit is widely recognized and utilized in the United States for measuring pressure in various applications, including boilers. The psi unit provides a practical measure that allows operators to easily assess the pressure levels within the system, ensuring safe and efficient operation.

While other units such as bar, kilopascals, and pascals are also valid measures of pressure, they are less commonly used in the context of steam boilers in the U.S. For example, the bar is primarily used in Europe, while pascals and kilopascals are often more relevant in scientific applications. Therefore, pounds per square inch is the preferred and standard unit for steam gauges in many boilers, making it the correct choice in this context.