Related Experiment Video
Updated: Jul 25, 2026

Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering
Published on: February 6, 2014
An Intercomparison Between NPL (India) and NIST (USA) Pressure Standards in the Hydraulic Pressure Region up to 26
J K N Sharma1, Kamlesh K Jain1, C D Ehrlich2
1National Physical laboratory, New Delhi, India.
Abstract:
Results are presented of an intercomparison of pressure measurements between the National Physical Laboratory (NPL), India, and the National Institute of Standards and Technology (NIST), USA, using piston gauge pressure standards over the range 6 MPa to 26 MPa. The intercomparison, using the NPL piston gauge pressure standard, with a nominal effective area of 8.4×10-5 m2 and the NIST piston gauge pressure standard, with a nominal effective area of 2.0× 10-5 m2 was carried out at the NPL. The intercomparison data obtained show a relative difference of 1 × 10-6 in the zero-pressure effective area (A0) of the NPL standard as obtained by the NIST standard. At 6 MPa the relative difference in effective areas is 3.5×10-6; at the full scale pressure of 26 MPa, the relative difference is 12×10-6. These differences are in excellent agreement with the statements of uncertainty of the respective standards as obtained from the primary standards of these two laboratories.
Related Concept Videos
Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer
Fluid Pressure
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific weight or...
Pressure Gauges
Concept of Pressure at a Point
In a fluid at rest, pressure acts equally in...
Measurement of Fluid Pressure
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
Static, Stagnation, Dynamic and Total Pressure

