From DT Online

Tension describes the forces which try to pull things apart, as if in a tug-o'-war. These forces are known as tensile forces and are measured in newtons.

  • Tension is the opposite of Compression.
  • The parts of a structure, or members, which contain these forces are known as Ties.
  • Components held in Tension need to be made from materials with good Tensile Strength.