# Thread: If you ate a 1kg steak would you weigh 1kg more?????????????

1. Something that has been bugging me and everyone i've asked for a long time now is the question:

If you weighed yourself, then ate a 1kg steak and re-weighed yourself, would you weigh exactly 1kg more???

Keeping in mind that this is over a ten minute time period and the steak weighs exactly 1kg after cooking.

Thanks for your replies in adavance.

2.

3. of course you would, mass can disaphere

4. Originally Posted by Zelos
of course you would, mass can disaphere
THANK YOU, that is exactly the kind of answer i was after.

If anyone disagree's please state your argument.

5. hi dyno & zelos,

Roughly it will be after 10 minutes your weight+1kg, but keep in mind that you need energie to keep you body working during these 10 minutes and your body also evaporates water (sweat).

In short, you will measure less than your weight+1kg, but this difference is so tiny that it is negligble I would think.

6. Originally Posted by SinMan
hi dyno & zelos,

Roughly it will be after 10 minutes your weight+1kg, but keep in mind that you need energie to keep you body working during these 10 minutes and your body also evaporates water (sweat).

In short, you will measure less than your weight+1kg, but this difference is so tiny that it is negligble I would think.
I agree that the energy used and sweating while tearing through a 1 kg steak would almost be un measureable.

7. If you calculate your extra weight just after you eaten your steak you’ll gain the 1kg. However it would be more correct to calculate the weight gained after digestion of the steak lets say 24h later. Do not know how many sugars are burned to do this.

8. Still.. it's an interesting question, but still i would have to say NO and YES. It will be at 1 kg you gain, but it won't be exactly 1 kg. You'll gain around 0,9990 kilograms.

9. Any other thoughts?

10. I would agree that you would weigh just a bit under 1 kg more. You can relate this to the law of conservation for momentum. It applies to weight as well although you will of course lose some of it as heat and movement.

No matter what goes in, it won't lose weight, only be divided into smaller pieces.

11. how can mass disapear?

12. mass cannot disappear (unless there is a secret of the universe that can tell us a way of making mass disappear0

13. With regards to the steak in our stomach's, would the mass turn into energy?
and therefor dissappear eventualluly???

14. no, its chemical energy taht is turned to usefull energy
(but the energy is stored as mass but its a insignifican amount)

15. Originally Posted by dyno355
With regards to the steak in our stomach's, would the mass turn into energy?
and therefor dissappear eventualluly???
interesting,

mass can turn into energie, this is a physical issue actually. But not inside your stomach . In nuclear reactions mass/energie conversions apply but fortunately not in your body.

16. In nuclear reactions mass/energie conversions apply but fortunately not in your body.
thats not entirely true, anykind of energy stored in a mass object increases the mass, temperature, chemical energy, potensial energy etc

17. Originally Posted by Zelos
thats not entirely true, anykind of energy stored in a mass object increases the mass, temperature, chemical energy, potensial energy etc
Hi Zelos,
I guess, your satement is wrong. First you cannot increase the mass by adding non-mass. It's just like, you increase the number of people by adding pigs to them or something like this.

Maybe you mean increasing the weight. I think that the energie will not increase the weight unless it is converted to mass.

18. i mean mass, we add energy to the object and therefor its mass increase according to
E=MC²
so mass increase is
dm=dE/C²

19. Originally Posted by Zelos
i mean mass, we add energy to the object and therefor its mass increase according to
E=MC²
so mass increase is
dm=dE/C²
i dont think this apply here since there is no mass conversion (like in nuclear fusion/fission) but it is here only about forming or destroying chemical bonds.

20. You breath the mass out. Oxidative respiration, when using energy O2 is turned into CO2. Breaking down of the sugar…to create ATP and ATP for oxidative respiration

21. sinman, that applies to everything where energy is. Doesnt matter what form the energy has it takes shape as matter, of course very little mass but still mass

22. The mass from the steak would go elsewhere, otherwise everything would weigh a lot!

It's the digestive system:

The steak goes into the stomach, is broken down, then it makes its way to the intestine, where the food is turned into energy, and what's left comes out... I think we know that part.

So in the long run, you wouldn't way 1KG more, but directly after eating, you would.

23. Originally Posted by Zelos
In nuclear reactions mass/energie conversions apply but fortunately not in your body.
thats not entirely true, anykind of energy stored in a mass object increases the mass, temperature, chemical energy, potensial energy etc
yes but wouldn't the amount of loss/gain of mass is insignificant when we're working with one kg

"would the mass turn into energy?
and therefor dissappear eventualluly???"

If You mean whether the whole 1Kg converts into Energy and disappears?
No, the energy is stored between the whatever forces or bonds between the matter and mass would be conserved. Any loss of mass would be lost as mass and not as energy: CO2, H2O, etc
and eventually excreted through whatever pore..

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