Time it takes for water to boil

In summary, the amount of time it takes for water to boil depends on factors such as stove type, water amount, and starting temperature. At higher altitudes, it takes longer for water to boil due to lower atmospheric pressure. The shape of the pot can also affect boiling time, with wider and shallower pots allowing for faster evaporation. Contrary to popular belief, adding salt to water does not make it boil faster. Finally, the starting temperature of the water can affect boiling time, with hot water boiling faster than cold water.
  • #1
ian 610
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Homework Statement



a 1200 watt heater is used for raising the temperature of 1 liter of water to boiling point. how long will itake for the water to boil of the initial temperature of the water is 20 degrees celsius? ( 1 cal = 4.19 joules)

Homework Equations




Q = mass * specific heat * (final temperature - initial temperature)

The Attempt at a Solution



basically clueless..
 
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  • #2
First find out the heat required to raise the temperature of 1 L water to boiling point using the equation you have.
Try it then tell me if you have any problem.
 

What is the typical amount of time it takes for water to boil?

The amount of time it takes for water to boil depends on several factors such as the type of stove, the amount of water, and the starting temperature of the water. On average, it takes anywhere from 5-10 minutes for water to reach boiling point.

Why does it take longer for water to boil at higher altitudes?

At higher altitudes, the atmospheric pressure is lower which means that the boiling point of water is also lower. This means that it takes longer for water to reach its boiling point as the temperature needs to be higher.

Does the shape of the pot affect the time it takes for water to boil?

Yes, the shape of the pot can affect the time it takes for water to boil. A wider and shallower pot will allow for faster evaporation and therefore a shorter boiling time compared to a taller and narrower pot.

Is it true that adding salt to water makes it boil faster?

No, adding salt to water does not make it boil faster. In fact, adding salt to water actually increases the boiling point, making it take longer for the water to reach the boiling point. The only way to make water boil faster is to increase the heat source.

Can the starting temperature of the water affect the time it takes to boil?

Yes, the starting temperature of the water can affect the time it takes to boil. Starting with hot water will take less time to reach boiling point compared to starting with cold water. This is because the water molecules in hot water are already moving faster, making it easier for them to reach the boiling point.

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