Add to ORKGThe article examines the thermodynamic arrow of time and the information arrow of time. The thermodynamic arrow of time is related to the second law of thermodynamics, and the information arrow of time shows that it is only possible to record information from the past, but not from the future. It has been concluded that on certain occasions the thermodynamic arrow of time and the information arrow of time may have different directions. According to the interpretation of Stueckelberg-Feynman-Sudarshan-Recami, the antiparticles are particles moving backwards in time. Classical thermodynamics can be extended to describe the physical properties of antimatter in two mutually exclusive ways: CP-invariant or CPT-invariant thermodynamics. From this...