If it is so "obvious" to you, why did you suddenly change your tune after I posted Reply 787 this morning at 11:10:37 AM PST? A mere 7 hours before you started implying you already knew what you were denying in multiple posts. Did you suddenly realize your argument stating displacement only measures volume was suddenly untenable? And wrong?
What mechanism is used in a scale to determine weight/mass? Weighing something in a gravity field is merely either comparing its mass against a known reference mass as in a balance scale, or measuring the amount of deflection a—either coil or straight—the mass of the measured item causes in a spring in response to the force of gravity. Neither of these methods will work in freefall.
In freefall, to determine the mass of an object one must be able to apply a known force for a specific period of time and measure the resulting change in motion and then calculate the mass. OR... on can use the displacement method for objects less dense than water. One can also use any liquid that is denser than the object to be tested. Mercury is useful for very dense objects that would sink in water.
*chirp, chirp*
Displacement measures volume, period. If an object floats you can weigh the displaced liquid.
But that isn't what's done when clculating body fat.
To calculate body fat you find the total body volume by displacement and enter that volume in a formula that includes weight. That requires total immersion, and total imersion by itself tells you nothing about the weight of an object.
In free fall? You are saying you can use displacement to measure mass in free fall? Surely this is a typo.
But gravity has no substance. It cannot be directly measured or observed. It can only be detected through its influence on objects within its field.
If that’s the case, why isn’t that categorized as the supernatural? It is no more detectable than God is and in no other way than God would be.
The assertion that gravity "...is no more detectable than God is and in no other way than God would be..." is simply wrong. Gravity is the first of the physical forces to be measured and defined by reliable equations.
I know of no equations defining or describing God that are equivalent to Newton's Laws or Einstein's general relativity. Nor do I know of any instruments that reliably measure the effects of the God field.
This really highlights the difference between science and theology. You may have personal knowledge of God, but your personal knowledge does not translate into formulas that can be universally confirmed. We have hundreds of religions and thousands of sects and cults.
But everybody in every country, under every political system and following every religion, can confirm Newton and Einstein.