Weight is best defined as:
c. The force exerted on a body by gravity.
Weight is the gravitational force acting on an object, typically measured in units such as pounds or kilograms. It varies depending on the gravitational field strength at a particular location.
Regarding the second part of your message about reasons for unexplained weight gain, there are various factors that can contribute to weight fluctuations despite efforts to lose weight. Some potential reasons for unexplained weight gain might include hormonal changes, medication side effects, stress, sleep deprivation, metabolic changes, and underlying health conditions. If you’re looking for a detailed discussion or list of those reasons, let me know!