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  1. #181
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    Quote Originally Posted by Roadrunnr72 View Post
    JustJeff was the first to post about them (post #39). That was part of the reason for me buying them, that and 50% off at Nalgene.
    Hmmm, I musta missed that post. I'd be willing to give it a try on JJ's recomendation. To bad I didn't order on discount day.

  2. #182
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    This is a cool idea, I might have to start carrying my Nalgene bottle around again. Does anybody know if they make a 24oz wide-mouth Nalg? My 32oz is a little more then I need.

    How "warm" was the container in the morning, for people who tried this? If I were to steep a teabag for 5-10 minutes before going to bed, would the nalgene be warm enough to get a cup of hot tea right upon waking up?

  3. #183
    Member HanginTom's Avatar
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    A few principles brought up quite a while ago in this thread really bother me.
    Please excuse my compulsion but i just read through a majority of this thread
    The "Mpemba effect" is extremely doubtful. That article previously sited (post #89) doesn't define freezing. Is it water molecules in a matrix forming a solid, or water regardless of physical state at 0 degrees Celsius or below? Also that "study" leaves out as many details as possible with "under varying condition" blah blah..
    I'll state this as plainly as I can. Say two identical 1.0 L bottles are filled with equal amounts of water. Initially one is at 50*C the other at 90*C. No matter how you cut it, the hotter water bottle will release more energy (heat) into it's environment until an equilibrium is reached with its surroundings. If these bottles were placed in identical (same temperature) isolated environments, the bottle with the hotter water will take longer to reach equilibrium. molecular structure has nothing to do with it. So given identical conditions, the hotter one will always reach a given temperature faster so long as that temperature is less than either initial temp.

    I do agree with JustJeff that a recently filled pee bottle will only warm your extremities, or any part of you that's below the temperature of your urinary bladder (hopefully not much of you). But in theory, if the bottle is properly insulated from any environment that is colder than your body temperature (outside your bag), body heat loss into that bottle is pretty small. Your body would probably lose more heat from placing it outside of your bag (or quilt) than it would to keep it at the temperature all night. Of course that's assuming that the bottle isn't pressed up against the outside of your sleeping bag or something. Unless you have a bag or quilt with about 3 feet of down loft or 10 inches of ccf, the bottle will eventually lose heat. Also if you don't have faith in the seal of your pee bottle, by all means get rid of that thing.

    i'd say for a hot water bottle, place that sucker right in between your thighs as JustJeff said. As far as a pee bottle goes, use it to war your fingers or toes or something then it's pretty much done.

  4. #184
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    Quote Originally Posted by LaVista View Post
    This is a cool idea, I might have to start carrying my Nalgene bottle around again. Does anybody know if they make a 24oz wide-mouth Nalg? My 32oz is a little more then I need.

    How "warm" was the container in the morning, for people who tried this? If I were to steep a teabag for 5-10 minutes before going to bed, would the nalgene be warm enough to get a cup of hot tea right upon waking up?
    They do make a 16oz wide mouth and a 24oz smaller top.

    The water is not hot in the morning, I would say it's warm.

  5. #185

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    Quote Originally Posted by fourdog View Post
    My feelings of using a hot water bottle of any kind to stay warm tells me that
    I don't have as warm a bag as I need for the temptures I'm in.

    Also in the deep cold I have greater fear of getting my bag wet then how
    much xtra heat the water bottle would give.

    If the sleeping system is not keeping you warm, add more layers or more clothing.

    fourdog
    I second Fourdog's comments. If your insulation system is correct for the temps anticipated including a healthy safety margin, then the only benefit of using a warm bottle is to "pre-heat" your bedding (IMO a poor return for the risk). The question is - Is the risk of a leak worth it? I prefer to focus on keeping my entire shelter/sleeping system in the most optimum condition possible to insure a pleasant and safe nights sleep. This is just my opinion and not necessarily the opinion of this network, it's subsidiaries or affiliates.

  6. #186
    Senior Member Mustardman's Avatar
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    Quote Originally Posted by HanginTom View Post
    The "Mpemba effect" is extremely doubtful.\
    In fact, it's a very cool effect of the physics of fluids and phase transitions, and has been rigorously confirmed by many researchers, to the point where a few intrepid science teachers now use it as a demo in their classrooms. It's actually a really cool effect for a fluids physics nerd such as myself.

    That said, it has pretty much no applicability to the discussion at hand regarding staying warm by heating bottles.

  7. #187
    Member HanginTom's Avatar
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    Call me old fashioned but I just can't wrap my head around a hotter bottle freezing faster than a colder one given identical conditions.

    I didn't mean to sound like a smarty pants, there's plenty out there that I don't know about.

  8. #188

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    It won't freeze faster, it loses it's heat faster. What was referenced above was about energy loss. The greater the differential, the faster the energy loss. However, there is more energy to lose, so it's still going to take longer. The colder bottle will freeze first.

    ~Dan

  9. #189
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    If you need a water bottle to be warm, you need more layers and you need to eat more food.
    Love my JRB BMB

  10. #190
    Senior Member BillyBob58's Avatar
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    Quote Originally Posted by tjm View Post
    If you need a water bottle to be warm, you need more layers and you need to eat more food.
    That is true. But, what if you can't stand to eat anymore, and you don't have anymore layers? What if the layers you have been using have been A-OK at 20*F, but now you are debilitated for any number of possible reasons and you are shivering at 30*F? Or, maybe you have messed up and some of your insulation is wet? ( stuff happens ) In any of the above, or if you find yourself cold for whatever reason, a hot water bottle can be a life saver. Other times, it can just be a luxury that allows you to not need to up so tight.

    It is probably not a good idea to count the hot water bottle as a routine part of your warmth system. Much better to have enough insulation so that you SHOULD be warm enough at temps a bit colder than at all likely.
    For I consider that the sufferings of this present time are not worthy to be compared with the glory that is to be revealed to us....that the creation itself also will be set free from its slavery to corruption into the freedom of the glory of the children of God. For we know that the whole creation groans and suffers the pains of childbirth together until now.
    Romans 8:18,21-22

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