Can two substances combined increase in overall weight?

Discussion in 'science, nature and environment' started by Spymaster, Apr 7, 2018.

  1. Spymaster

    Spymaster Cockney Wanker

    Is it possible to add 100 grammes of something to 100 grammes of something else, and for the combined weight of the product to be more than 200 grammes due to some kind of reaction?

    I've been arguing that it's absolutely not (details later).

    Am I wrong?

    2hats littlebabyjesus gentlegreen
    Last edited: Apr 7, 2018
  2. 2hats



    (e2a: eg hit lithium 7 with a proton and you get two alpha particles - the rest mass of the latter exceeds the former though kinetic energy has dropped)
    Last edited: Apr 7, 2018
  3. Pickman's model

    Pickman's model Every man and every woman is a star

    Yeh get dodgy scales
  4. Pickman's model

    Pickman's model Every man and every woman is a star

    What sort of reaction have you had from kris?
  5. Spymaster

    Spymaster Cockney Wanker

    Negative usually.

    I'm in a boozer and a fella was telling a story about his rucksack getting heavier and heavier during the day. He checked his tote and found that the water was leaking from a bottle in his bag into, err ... his bag, which was causing him some weight discomfort. :facepalm:

    This is very clearly ludicrous but it eventually produced a chemistry/physics discussion with someone else saying that it was possible with some chemicals. I've called massive bollocks but the second guy is adamant that it can happen with certain substances. I'm asking "where does the extra weight come from?"

    I'm a bit pissed too at the moment, so just wanted to double check with you lot that I'm not just about to get pwned on some weird science that I'm unaware of.
    Last edited: Apr 7, 2018
    A380 and Pickman's model like this.
  6. 2hats


    Energy. It's a basic tenet of special relativity : mass-energy equivalence. The two are interchangeable.
    NoXion likes this.
  7. existentialist

    existentialist Danced on by a twerking bee

    You bastard :D
    2hats and Pickman's model like this.
  8. FridgeMagnet

    FridgeMagnet Administrator

    2hats is of course correct that energy could be converted into mass, but I suspect that this occurs rarely if ever in the context of backpacks, or everyday life generally. You would need an awful lot of energy to produce a change in mass that a person could notice.

    Of course, sometimes things can combine with the air and increase in mass (eg oxidising metals) but then you’re adding mass from the air. In a closed system there would be no overal change.
    ricbake, Chz, 2hats and 3 others like this.
  9. Pickman's model

    Pickman's model Every man and every woman is a star

    Are you in the boozer with auld spy?
    Badgers likes this.
  10. Spymaster

    Spymaster Cockney Wanker

    Does that mean I'm right?
  11. FridgeMagnet

    FridgeMagnet Administrator

    If your friend was in fact the Flash he could have been running at relativistic speeds and the mass of his backpack would have increased. Something the comics seem to ignore.

    That would mean you’ve found out his secret identity which is worth some money. He should at least get the next round in.
  12. Puddy_Tat

    Puddy_Tat lumpen proletaricat

  13. farmerbarleymow

    farmerbarleymow cooking expert and general daft apeth

    Maybe the pub has fallen through a wormhole and is travelling at an appreciable fraction of c, hence the weird effects on the backpack.
  14. Spymaster

    Spymaster Cockney Wanker

    Ahhhh, this could fuck me up.

    Can the addition of air increase weight though?
  15. farmerbarleymow

    farmerbarleymow cooking expert and general daft apeth

    Yes, as air has mass. It's just mass that happens to float.
    Spymaster likes this.
  16. twentythreedom

    twentythreedom Seagulls are cunts

    Lol, bet spy's gutted. Spy the next round is on you mate :thumbs:
  17. FridgeMagnet

    FridgeMagnet Administrator

    Yes, but I wouldn’t give in on that - I’d point out that you’re adding mass from the air, it doesn’t come from nowhere. It’s like blowing up a balloon and it weighs more and saying “look the balloon is heavier now by magic” - it’s heavier because you’ve filled it with air, which has mass.
    NoXion, gentlegreen and Spymaster like this.
  18. existentialist

    existentialist Danced on by a twerking bee

    I wish...
  19. PippinTook

    PippinTook Well-Known Member

    I've often wondered why eating 200g of chocolate turns into 2lbs of fat the next day.


    S☼I, spanglechick, JimW and 6 others like this.
  20. The only way that would be possible is if the reaction brought in surrounding elements :/ (air)
    Yuwipi Woman and Spymaster like this.
  21. Spymaster

    Spymaster Cockney Wanker

    Totally the same as that.

    I eat half a pound of MiL's curry and put on a kilo ... honest!
  22. Spymaster

    Spymaster Cockney Wanker

    Actually, I think this was what he was arguing.

    Fortunately we've left that pub and are now elsewhere

    HA! Take that, science boy :p
    Last edited: Apr 7, 2018
  23. It's more likely that the more your man drinks, the heavier the bag feels.
    gentlegreen likes this.
  24. farmerbarleymow

    farmerbarleymow cooking expert and general daft apeth

    Dark matter contamination in the food.
  25. farmerbarleymow

    farmerbarleymow cooking expert and general daft apeth

    Perhaps the water is being converted into heavy water through neutrino bombardment. :hmm:
    AverageJoe likes this.
  26. Idaho

    Idaho blah blah blah

    Sugar triggers an insulin response. Your body then converts an increased amount of your blood glucose to fat.
    PippinTook likes this.
  27. 19sixtysix

    19sixtysix Life as viewed from a Gay Gorbals Garret

    If you perform your chemical recation in an atmosphere you may find the product is heavier than the two starting products as the gas in the atmosphere has reacted as well.
  28. mauvais

    mauvais change has become unavoidable

    Yes. You could simply change the force of gravity - suppose for example that your experiment caused another planet to collide with the Earth.
    8ball likes this.
  29. PippinTook

    PippinTook Well-Known Member

    It's still weird.
  30. gentlegreen

    gentlegreen "grade A liberal mug"

    As opposed to what ? Leaving a toxic level of glucose in the blood ?

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