Discussion Overview
The discussion revolves around the concept of "mass excess" in nuclear physics, specifically questioning whether there are macroscopic examples where this phenomenon is significant. The scope includes theoretical considerations and potential experimental observations related to binding energies.
Discussion Character
- Exploratory, Technical explanation, Debate/contested
Main Points Raised
- One participant suggests that a macroscopic amount of iron could serve as an example of mass excess, noting its mass is nearly 1% smaller than a corresponding amount of hydrogen and neutrons due to nuclear binding energy.
- Another participant mentions that the nuclear binding energy can account for nearly 1% of the total energy, while electromagnetic binding energy is less than 0.01%, and chemical binding energies are on the order of 10-9.
- A later reply inquires whether the mass excess has been measured in the context of electromagnetic binding, seeking clarification on experimental evidence.
- Another participant responds that mass excess related to electromagnetic binding is somewhat measured as part of nuclear binding energy, but notes a lack of dedicated measurements for electron binding energy specifically.
- It is suggested that calculations could be performed based on published results to estimate these values.
Areas of Agreement / Disagreement
Participants express differing views on the significance and measurement of mass excess in macroscopic examples, indicating that multiple competing perspectives remain without a clear consensus.
Contextual Notes
The discussion does not resolve the assumptions regarding the measurement of binding energies or the specific conditions under which mass excess might be considered non-negligible.