-standards-d_769.html" title="bsi piping standards"> <b> BSi - Pipe, Tube and Fittings Standards and Specifications </b> </a> - British standards and specifications for pipe, tube and fittings</li> <li> <a href="https://www.engineeringtoolbox.com/emissivity-coefficients-d_447.html" title="radiation heat transfer emmisivity coefficients"> <b> Emissivity Coefficient Materials </b> </a> - The radiation heat transfer emissivity coefficient of some common materials as aluminum, brass, glass and many more</li> <l