👉 The inches fluid, also known as the "inch of fluid" or simply "in", is a unit of measurement used primarily in the United States for expressing volume. It is defined as the volume of a cube with sides of approximately 25.4 millimeters (0.9985 inches) each, when filled to the brim with a fluid of standard density, such as water. This unit is particularly common in applications like plumbing and HVAC systems where precise volume measurements are crucial, such as determining the capacity of tanks, pipes, and other fluid-handling components. The inches fluid is often used interchangeably with the "gallon" for liquid volumes, but it specifically refers to volume rather than weight.
