what is the factor in the human bidy which decides weight(mass) of a person?

Question

some people look heavy but they are not and some skinny people weigh beyond imagination or belief. why?

Answer 1

Because weight (mass) is determined by the gravity of the planet or other celestial body you are on, or whether the body is subjected to acceleration or deceleration, or "G" forces.

Actual weight as you describe does not come from anything inside the body.

Of course in space, all is weightless in the absence of a planet's or moon's gravity.

How strong is the gravity on your planet?

Answer 2

Well, there's Metabolism involved. Also, the ammount of food you eat. And muscle tone, which is denser than fat. I know a very short man ( 5" even ) Who weighs 180 pounds of pure muscle, yet his BMI says that he's overwieght, and he is not! It depends on how much you workout and how you are genetically inclined towards heaviness or lightness...

Answer 3

The value of g where you are (it decreases as you go higher)

The speed you are travelling, M=m/(sqrt(1-[v^2/c^2]))

Both are insignificant in everyday terms, the first only really matters in space and the second only when v approaches c.

otherwise its metabolism, how quickly the body burns food for energy

Answer 4

Muscle mass. Muscle is heavier then fat. So a relatively thin muscular person will weigh more then a relatively thin non-muscular person.