A reinforced concrete T-beam has the following properties: flange width, b = 1370 mm; flange thickness, tf = 130 mm, width bw = 300 mm, effective depth, d = 610 mm, As = 2950 mm², f’c = 28 MPa, fy = 414 MPa.

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.