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Freezing water
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<blockquote data-quote="JR Cattle Co." data-source="post: 481706" data-attributes="member: 7471"><p>Pressure and heat are inversely related... Example:As you decrease the pressure, the water molecules heat up, just as when you increase pressure, the water molecules cool down. Heat in these circumstances is produced by the friction of the molecules as they collide with eachother... so, if you increase the pressure, the area for the molecules to travel is smaller, resulting in less collisions and therefore less heat.. If you decrease the pressure, then the area for molecules to travel increases resulting in more violent collisions which results in more heat. Take this for example: As most of us know, when a cow kicks, it hurts worse if she is at a full legs length away as opposed to being snugged up to her side. The potential energy of the cows kick changes as you move nearer or further away. The closer, the less violent and painful the kick is, as you move further away, the more violent and painful the kick becomes. The same is true with the water molecules. The reason adding salt to water makes it cooler, is because the chemical reaction between the hydrogen molecules in the water and the sodium molecules in the salt results in heat (energy) being pulled from the solution (the water) in order to break the bonds of the NaCl (salt). This is an exothermic reaction because the heat (energy) is pulled from the water resulting in the temperature decrease.</p></blockquote><p></p>
[QUOTE="JR Cattle Co., post: 481706, member: 7471"] Pressure and heat are inversely related... Example:As you decrease the pressure, the water molecules heat up, just as when you increase pressure, the water molecules cool down. Heat in these circumstances is produced by the friction of the molecules as they collide with eachother... so, if you increase the pressure, the area for the molecules to travel is smaller, resulting in less collisions and therefore less heat.. If you decrease the pressure, then the area for molecules to travel increases resulting in more violent collisions which results in more heat. Take this for example: As most of us know, when a cow kicks, it hurts worse if she is at a full legs length away as opposed to being snugged up to her side. The potential energy of the cows kick changes as you move nearer or further away. The closer, the less violent and painful the kick is, as you move further away, the more violent and painful the kick becomes. The same is true with the water molecules. The reason adding salt to water makes it cooler, is because the chemical reaction between the hydrogen molecules in the water and the sodium molecules in the salt results in heat (energy) being pulled from the solution (the water) in order to break the bonds of the NaCl (salt). This is an exothermic reaction because the heat (energy) is pulled from the water resulting in the temperature decrease. [/QUOTE]
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