srx70024
Pro
Global warming
The thing that gets me about these global warming claims, is that the earth is about 4.5 billion years old. Humans have only been on this planet for 5 million years and the accurate weather info that we have only goes back a few hundred years. Here's an analogy for this timeline - If the age of the earth was a timeline of a mile long, 5280 ft, the amount of time that humans have been on the earth would equal less than 12 inches. ooof.
So how do we know that this "warming cycle" is not part of a natural reoccuring phenomenon? From what I've read, this same warming cycle occured back in the late 1800's. Then in the 1950's to 1970's the earth went through a cooling cycle. What's next? Who knows. I just try to apply commen sense to things like this at times.
Just bring me some snow, that's all.
The thing that gets me about these global warming claims, is that the earth is about 4.5 billion years old. Humans have only been on this planet for 5 million years and the accurate weather info that we have only goes back a few hundred years. Here's an analogy for this timeline - If the age of the earth was a timeline of a mile long, 5280 ft, the amount of time that humans have been on the earth would equal less than 12 inches. ooof.
So how do we know that this "warming cycle" is not part of a natural reoccuring phenomenon? From what I've read, this same warming cycle occured back in the late 1800's. Then in the 1950's to 1970's the earth went through a cooling cycle. What's next? Who knows. I just try to apply commen sense to things like this at times.
Just bring me some snow, that's all.
NB-NYTRO
TY 4 Stroke Junkie
Good point. The Sciencetist need something to talk about.. Ha Ha. :ORC
APEX 21
Expert
I hope we get so much snow that we have to tunnel through it like in the 30's
Snowaholic
Pro
hmmm, I thought the hole in the "O-zone" was created by Dr. Evil shootin a frickin lazer beam at the "O-zone" protective layer.
Oh no wait he went with the "Preperation H" scheme. Nevermind.
Oh no wait he went with the "Preperation H" scheme. Nevermind.
hahler2
Extreme
I just read this topic so I'm responding a little late but on the first page when they were talking about warm water freezing faster than cold water that is true. In chemistry in college we learned that cold water boils faster than hot water and hot water freezes faster than cold water. I used to know the whole explanation why but it was so long ago that I can't remember. But it is a proven fact.
yamahey
Extreme
Sorry hahler2, I don't buy it. If you cool the hotter water, at some point it will be the same temp as the cooler water. Then it will take just as long to freeze. But you didn't cool it to the same temp as the cooler water in negative time. Perpetual motion is possible too.
actionjack
TY 4 Stroke God
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No Offense hahler2, but that is a myth. Again, the specific heat of water is a constant that's what we learned in my college courses, physics and chem. Of course that was LSU.
http://itotd.com/index.alt?ArticleID=521
http://itotd.com/index.alt?ArticleID=521
monker
TY 4 Stroke Guru
on the hot water vs cold water freezing, both are right, the catch is certain conditions....
The Mpemba effect is the somewhat surprising phenomenon whereby hot water can, under certain conditions, freeze faster than cold water.
The effect is named for its rediscoverer, the Tanzanian high-school student Erasto B. Mpemba. He first noticed the effect in 1963 after observing the freezing of ice cream in cookery classes, and went on to publish experimental results with Dr. Denis G. Osborne in 1969. At first sight, the effect is contrary to Newton's law of cooling. Despite this, it has been widely reproduced in controlled experiments, although it is still poorly understood. The effect is not universal under all experimental conditions, so its exact requirements have proved difficult to specify.
It is believed that the effect arises from some interaction between:
Evaporation reducing the volume to be frozen
Effect of boiling on dissolved gases and ions (lime scale formation). As more dissolved material is added, the freezing point lowers and more time is required to freeze.
Convection
Effects from surroundings such as the insulating effects of frost
Supercooling, initially hot water may be less likely to supercool than cold water. Therefore ice formation occurs at different final temperatures in hot and cold water.
Different definitions of the term "freezing". Is it the physical definition of the point at which water reaches 0°C, or the point at which the water forms a visible surface layer of ice, or the point at which the entire volume of water becomes a solid block of ice?
The material freezing in question. Mpemba's initial observations were with ice cream mixtures, not water. The anecdotal evidence for the Mpemba effect came from a variety of ice cream manufacturers and the food processing industry worldwide, for a variety of water containing foodstuffs. However, the controlled experiments verifying the effect generally used pure water.
www.school-for-champions.com/science/mpemba.htm
www.physics.adelaide.edu.au/~dkoks/Faq/ ... water.html[/b]
The Mpemba effect is the somewhat surprising phenomenon whereby hot water can, under certain conditions, freeze faster than cold water.
The effect is named for its rediscoverer, the Tanzanian high-school student Erasto B. Mpemba. He first noticed the effect in 1963 after observing the freezing of ice cream in cookery classes, and went on to publish experimental results with Dr. Denis G. Osborne in 1969. At first sight, the effect is contrary to Newton's law of cooling. Despite this, it has been widely reproduced in controlled experiments, although it is still poorly understood. The effect is not universal under all experimental conditions, so its exact requirements have proved difficult to specify.
It is believed that the effect arises from some interaction between:
Evaporation reducing the volume to be frozen
Effect of boiling on dissolved gases and ions (lime scale formation). As more dissolved material is added, the freezing point lowers and more time is required to freeze.
Convection
Effects from surroundings such as the insulating effects of frost
Supercooling, initially hot water may be less likely to supercool than cold water. Therefore ice formation occurs at different final temperatures in hot and cold water.
Different definitions of the term "freezing". Is it the physical definition of the point at which water reaches 0°C, or the point at which the water forms a visible surface layer of ice, or the point at which the entire volume of water becomes a solid block of ice?
The material freezing in question. Mpemba's initial observations were with ice cream mixtures, not water. The anecdotal evidence for the Mpemba effect came from a variety of ice cream manufacturers and the food processing industry worldwide, for a variety of water containing foodstuffs. However, the controlled experiments verifying the effect generally used pure water.
www.school-for-champions.com/science/mpemba.htm
www.physics.adelaide.edu.au/~dkoks/Faq/ ... water.html[/b]
do we even want to get into if the wind can actually make water freeze faster :?
hahler2
Extreme
lol. I would have to say this is one of the more scientific discussions I've ever seen on a snowmobile forum. =)
