Everyone will say that the scale measures weight or body mass, which is essentially the same, it all depends on what system you are considering. Putting a watermelon on one bowl, and on the other weights, we will accurately determine the weight of our vegetable. You probably already noticed that all our measurements are based on a comparison. Time we compare with the count, the temperature with the size of the body, and we compare the weight with the same weight. Conditionally it can be just a stone, or, for example, a liter of water. You can take as a basis anything you like, if only the others agreed with you, you came to a consensus. But what do we actually measure with weights. First, weight is a physical concept. But in fact it is the reaction of the body to the action of the force of gravity of the Earth. On the moon, the reaction is different, but the body is the same. I hope you do not think that the cosmonauts who visited the moon became easier. Scales measure, the force with which our Earth acts (attracts) the body. Not the weight of the body, as such, and not its effect on the support. It is important to understand the cause of this impact, the force of gravity of the Earth. From the subject of physics we know that this interaction is mutual, but in fact we do not think that the watermelon attracts the earth, even with insignificant force.
If we really want to determine the body weight. This can only be done through an account. From the chemistry course, we know that all substances consist of protons and neurons. And the atomic weight is the sum of their number. For example, Carbon has the serial number 12. The core of Carbon contains 6 protons and 6 neurons. The correct way to determine the weight (amount of substance) you need to do is through an account. Having counted the number of atoms and multiplying by the atomic weight of one atom, we get the total amount of matter. This is the only correct definition of weight as such. The physical weight, of course, will be different and depend on the interaction of the bodies with each other. On the Moon, the body weight will be quite different. Because the Moon acts on the body with a different force. Our watermelon will weigh less, but the number of atoms in it will remain unchanged. And the atomic weight and quantity of matter are always and everywhere in the universe will be unchanged.
Of course, in everyday life we will not use the calculation of atoms, and this is impossible.
As always, it happens, the person for convenience, not to compare with the stone, introduced conventional units such as kilograms, pounds, etc.
Finally. Nothing is measurable in our world. Since there are no temperatures, times, masses, electric current, voltage, pressure, etc. The only thing that we can measure is the size or length or distance. We do this very simply, with the help of a ruler or a hand, or a step, anything. Comparison of our body with the ruler does not depend on conditions in any way, and therefore it will be identical under any conditions in our universe. The size of the watermelon in the measurement and on the Moon will remain the same!
I was not going to discredit such a science as a physicist in any way. Thanks to physics, people build spacecraft and grow bread. But physical quantities, these are all calculated quantities, and have no relation to the real world. They are very similar to the intermediate solutions, in a complex task.
I want to draw your attention to the fact that our world is much simpler and more understandable, and it is possible to understand it without physics. I'm interested in knowing the truth!
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