I am a science nerd extraordinare, and am somewhat of a compulsive teacher, so for anyone who has any curiosities whatsoever - how does something work, what does a scientific concept really mean, what the hell is a dimension, that kind of stuff, or anything really. I study everything, and I enjoy flexing the curiosity muscle as much as possible, so consider me your Q&A guru forever more. No question too big, no question too small.

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Comment by Glen Rosenberg on May 15, 2011 at 9:11pm
Sounds like a canned response!
Comment by John Camilli on May 15, 2011 at 7:53pm
Lol, I didn't see this last post of yours, Glen. No, it's not safe to leave food in an open can. Once the interior contents have been exposed to oxygen, oxidation will begin occuring in the metal and will contaminate the food. You can actually taste the metalic flavoring after a while, but I wouldn't recommend trying it.
Comment by Glen Rosenberg on February 8, 2011 at 4:56pm
John, once canned food is opened is it safe to leave it in a can?
Comment by John Camilli on January 10, 2011 at 10:24pm

Yes, the weight will change. Assuming that we're dealing with regular old H2O, the ice will always be lighter, per volume, than the water. The geometric formation of ice crystals of water is one that maintains big gaps between the molecules, relative to when it is in liquid form. Many people think the expansion of freezing water has to do with airbubbles being trapped between the crystals, but this is not quite accurate. Air molecules are trapped, but those gaps would be there even if the air weren't because of the way the crystal forms. The boyancy, of course, is effected by the fact that it usually is air that gets trapped between ice crystals and not something heavier. But boyancy has nothing to do with weight. The comment about relative density was more appropriate.

 

Now, your questioner might have been trying to trick you by saying 'or the same volume of ice,' thinking that it SHOULD be the same weight, but that would only be correct if he had said the same "amount" of ice, which of course would have a greater volume than the same AMOUNT of water, although it would weigh the same.

Comment by Richard Healy on January 9, 2011 at 11:22pm

On New Years Eve a distant relative, knowing me to me be a sciencey type asked me which weighed more a volume or water or the same volume of ice.

 

I was admittedly a bit drunk by the point some muttered somethign about relative density and buoyancy - and that did the trick.

 

But there y'go the weight - does it change? (asuming none is lost through evaporation / bits falling off or added through additional snowfall etc)

Comment by Rachel Williams on January 8, 2011 at 5:14am

Legs first when getting in the bath. Wouldn't say I usually shower after being active. I'm all over the place with my self cleaning regime. =)When I have showered with him after both of us were in the gym He still can't take the heat. Only time I don't like a hot shower is when I'm hot from working out or cause it is really hot outside.

some more info that might shed light... My body temp tends to be a degree or so below normal. So for example when checking for a fever I know I've got a slight one when my temp is 'normal'. Also years ago I was told I have low blood pressure, not sure if that is still the case. Does that change? I've always taken really hot showers.

Just thinking... When I was little I remember putting my hands in my Grandmother's kitchen sink where she was washing dishes and the water was scalding! She would also handle pots with her bare hands that most people wouldn't go near without a pot holder. I thought this was amazing and always wanted to be like her (for other reasons) so maybe unconsciously I have made a point of acclimatising myself to hotter water temps. It'd be interesting to see if I still find her washing up water too hot. I've been told by several people they find mine too hot.

Comment by John Camilli on January 8, 2011 at 12:10am

Hmmm, well that does baffle me a bit. Hey, I said ask me anything, I didn't say my answer would be anything close to right, lol.

 

Poor circulation will not necessarily mean your heart rate is slow. If the circulatory problem is due to blockages, constrictions, inflamation, or weak vessels, your heart could be working overtime trying to get the same work done. I wonder do you take a bath and stick your legs right into the hot water, or do they take longer to acclimate? Is it just your upper body that can take the heat right away?

 

Another thought I had was that maybe your are just more active than they are, or are more likely to take a shower right after you have been active, at which point your internal body temperature is already higher than theirs. Actually, that may fit in with the weak circulation theory because that would be like being more active all the time.

Comment by Rachel Williams on January 7, 2011 at 7:29pm

Thanks John. I'm still confused though.

My previous bf thought the water was way too hot and he had a lot more body fat than I do. My current bf thinks it is too hot and has far less body fat than me. I have a fast metabolism and eat huge portions but I have very poor circulation, as my feet are always icy cold and take forever to warm up. How does all that fit into your theory?

Not sure if my circulation is related to the speed of my heartrate at all but I would think it means it is slow? Maybe my heart is fast but it just sucks at pumping. =)

Comment by John Camilli on January 6, 2011 at 10:37pm
I have to correct something I said earlier in a reply to psthimiest. I said that pop was basic, but I was confusing myself. Pop is acidic. It contains phosphoric acid. Yummy. I don't like it unless I can feel it eating the flesh on the inside of my throat on the way down.
Comment by Glen Rosenberg on January 6, 2011 at 9:21pm

On the other hand if you buy into exegesis of six k universe and evolution you'd have to postulate a super speedy punctuated equilibrium. Then again how would you reconcile that with immutable species and special creation. Nah, there is no conflict between science and religion that a pope cant solve after the fact is inescapable.

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