| Tesla: | The S.I. unit of magnetic flux density, defined as the magnetic flux density of a magnetic flux of 1 Wb through an area of 1m2. |
| Thermal Capacity: | The quantity of heat required to raise the temperature of the whole body by 1 . |
| Thermal Equilibrium: | When the two bodies in contact are at the same temperature and there is no flow of heat between them, these are said to be in thermal equilibrium. |
| Thermal Expansion: | The increase in the size of an object on heating. |
| Total internal reflection: | Condition where all light is reflected back from a boundary between materials; occurs when light travels from denser to rarer medium and angle of incidence is greater than the critical angle. |
| Transverse wave: | A wave in which the particles of the medium oscillate in a direction perpendicular of the direction of propagation of wave. |
| Trough: | The point of maximum negative displacement on a transverse wave. |
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