New Light on the Arrow of Radiation

Price, H.T.W.

doi:10.1093/acprof:oso/9780195117981.003.0003

Cited by 1 publication

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“…Entropy can be thought of as a measure of microscopic disorder, implying that the Second Law of thermodynamics asserts that time is asymmetrical with respect to the amount of order in an isolated system. As time increases, a system statistically becomes more disordered [7].This asymmetry is used empirically in distinguishing between the future and the past, though measuring entropy does not accurately measure time [8]. In an open system, entropy can locally decrease with time: living systems decrease their entropy by expenditure of energy at the expense of environmental entropy increase [9].…”

Section: Thermodynamic Arrow Of Time and Entropymentioning

confidence: 99%

Influence of Thermodynamic Arrow of Time on Entropy

Peter,

Lydia,

Edward

2023

PSIJ

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This study assessed the influence of thermodynamic arrow of time on entropy for boiled cooling water (physical process), the universe and the air (natural process). This was done by determining the entropies of boiled water, the universe and air. This was achieved by using 1.5 litres of pure water, a 2 liter electric kettle, a digital thermometer, a digital weighing scale and a stop watch. The entropy values of boiled water as it was cooling, was in negatives, that of the universe was in negatives and positives and that of air (natural process) was positive. This showed that for any physical process, (boiled cooling water and the universe) thermodynamic arrow of time does not influence entropy in the positive direction while as for a natural process (air), thermodynamic arrow of time influences entropy in the positive direction. The boiledcooling water was a non-spontaneous process, the universe was both non-spontaneous and spontaneous and the air was a spontaneous process. The study has shown that thermodynamic arrow of time influences only entropies of natural process in the forward direction but for the physical process, the entropy can be influenced both backwards and forwardwise.

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Section: Thermodynamic Arrow Of Time and Entropymentioning

confidence: 99%