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If you put hot water in a pan does it take longer to boil than cold water?
Wiki User
∙ 13y ago
The temperature of the water has to get to the same temperature of the room before it will start to increase in heat. But cold water will boil faster due to the fact it is heating up from the ambient air, and the hot surface.
NO - if the water starts hot, it will boil SOONER than cold water. A quick thought experiment should be enough to convince most people. Assume "cold" water starts at 60°F and "hot" water starts at 104°F. If you take a pan with cold water and start to heat it up, it will heat up until it reaches 104 °F, the temperature of the "hot water", then continue heating until it reaches boiling point (212 °F at sea level - lower as you go up in elevation and atmospheric pressure decreases). It takes a finite amount of time for the originally cold water to reach the same temperature as the "hot" water - so that time is added onto the time it takes to go from 104 °F up to 212 °F. A possible point of confusion is that as water heats up, the air dissolved into it comes out of solution. These tiny bubbles of air are NOT boiling water. Since hot water has already been heated up enough for most of the air to come out of solution, you will see a lot less of the tiny bubbles and only see bubbles start to form when it starts to truly boil. If you mistake the bubbles of air coming out of solution for boiling, you might mistakenly think the colder water started boiling sooner. If you actually measure the temperatures though, you will see that it takes longer to boil the initially cold water than it takes to boil the same amount of initially hot water using the same heat source and the same pan (assuming the pan starts out at the same temperature for both scenarios). If you are still unconvinced, try it out. I suggest that for the cold water that you first heat it up to get the air out of it and then cool it back down before starting the experiment. That way you will be less likely to mistake the air bubbles for boiling water.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoMore than what ? ?
To what temperature ? ? ?
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Why does it take the water longer to boil when it has salt in it?
impurities rise the boiling point
How much salt do you put in to make the water boil faster?
Adding salt to water will make it take longer for the water to boil. You should wait until the water is already boiling to add salt.
Why does it take longer for water to boil when there's more of it?
It takes longer to boil because there is more of it that therefor takes longer to heat up. This is because a larger volume of liquid is needed to be heated to the same temperature as a small volume of liquid.
Why does it take sugar water longer to boil than plain water?
When a solute is added to a solvent, such as water, it increases the boiling point. Instead of boiling at 100 degrees Celsius (for water), it will boil at a higher temperature. This phenomenon is called boiling point elevation.
How long does it take to boil sugar to 300 degrees?
it takes me 20 min to boil water and sugar to 300 degrees.
Do larger amounts of water take longer to boil?
Yes
Why does salt water take longer to boil?
The boiling point is increased after adding impurities to water.
Why does it take the water longer to boil when it has salt in it?
impurities rise the boiling point
Will water with salt evaporate faster than water without salt experiment?
Water with salt will actually take longer than water without salt to evaporate. This is due to boiling point elevation. If you put a solute into water, it will make it more difficult to boil, and therefore will boil at a higher temperature. Since it takes longer for the salt water to boil, it will take longer for it to evaporate as well
Why does it take a less time to boil little ammounts of water?
It takes less time to boil little amounts of water because there is less water to boil. The more water in the pot, the longer it takes to heat up.
Why does half a full kettle take less time to boil a full one?
That is not possible a full kettle has more water,therefore it will take longer to boil.
Why does it take alka- seltzer longer to dissolve in cold water?
Beause cold water is less dissovlable
How much salt do you put in to make the water boil faster?
Adding salt to water will make it take longer for the water to boil. You should wait until the water is already boiling to add salt.
Why does it a take a full kettle of water to boil longer than a half full kettle?
The more water in the kettle, the longer it will take to reach boiling point. This is why it is wasteful in energy to boil a full kettle if you only want to brew a small cup of tea.
Why does water bodies don't get as hot or cold as land masses?
They take longer to get hotter and take longer to get cooler.
Does looking at water make it take longer to boil?
No, it only makes it feel longer because you are more aware of the time being taken.
Why does salt take longer to melt in cold water?
because cold water molecules move slower at colder temperature.
