How Long Does It Take For Boiling Water To Cool? Detailed Explanation

Hot water usually features more minerals and tends to have a smell that can dictate the food flavor. Therefore, worldwide chefs prefer cold or room temperature water for cooking. Apart from cooking, estimating the exact time to cool boiling water is nothing less than an everyday requirement.

Now, how long does it take for boiling water to cool? It can take from 40 minutes to 1 hour to cool boiling water. Water (16.6 cubic inches volume) boiled in a pan (6.5 inches diameter, .5 inches deep) will reach 76°F temperature in 40 minutes.

Understanding the cooling mechanisms of boiling water and the dominant factors needs more explanation. The following segments cover all the necessary information.

How Long Does It Take For Boiling Water To Reach Room Temperature?

When the water molecules receive heat, there starts a vibration leading to friction. This molecular friction starts the heating procedure, and once it reaches 212°F, water starts boiling.

Boiling water takes somewhere between 40 minutes to 1 hour to reach room temperature. The temperature fluctuates considering whether the water is in a mug, pan, or in a plastic jar. Again, if you put the water in the fridge or freezer, the time frame will be different.

How Long Does It Take For Boiling Water To Reach Room Temperature

In the fridge, water can take 25 to 30 minutes, and in the freezer up to 15 minutes to reach room temperature. But the time actually depends on so many factors. The prominent factors are weather humidity, surface material, space, and water volume.

To cool the water down, you just need to remove the heat. And once the molecular friction is stopped, water starts cooling down.

Factors that Dictate the Time for Boiling Water to Cool

The specific time for boiling water to cool depends on different factors, which are explained below.

1. Material of the Surface

The surface material where the water is stored plays a role in the cooling time. Plastic is an insulator and thus reacts very slowly to the change in the surrounding temperature. On the other hand, metals like aluminum feature high thermal conductivity.

Therefore, it is extremely reactive to the surrounding temperature change. Water kept in a plastic pot will cool slower than water kept in an aluminum pot or pan.

Factors that Dictate the Time for Boiling Water to Cool

2. Humidity in the Weather

High humidity in the atmosphere refers to less evaporation and less heat extraction at the same time. Only 50% humidity in the air can make you feel 95°F temperature as 107°F.  On the other hand, if the weather is dry, the water evaporation rate will be higher, leading to faster heat extraction.

Again, more evaporated water means less remaining water in the pan. And less water will consume less time to cool. Hence, water in a dry atmosphere cools faster than water in high humidity.

3. Surface Space and Water Volume

The surface space ratio to the water volume is crucial in cooling the water. When the space is larger, and the water volume is higher, it takes less time to reach a certain temperature. According to research, we have created a table that shows the relation of time, surface space, water volume, and temperature.

Surface Space

Water Volume Time Reduced Temperature
Diameter: 3 inches

Depth: 2 inches

14.1 cubic inches 40 minutes


Diameter: 6.5 inches

Depth: .5 inches

16.6 cubic inches 40 minutes


It shows within the same time of 40 minutes, the water temperature remains higher than the water of higher volume and smaller surface area. It means slow cooling. And when the opposite happens, the temperature decreases more within the same time frame.

In short, in larger surface areas the cooling is faster than in smaller surface areas.

How to Cool Boiling Water Faster? Methods that Work

So far, we discussed the mechanisms of cooling down boiling water, and now let’s focus on how to actually achieve it. The following steps will help you cool boiling water faster.

i. Ice Bath with Salt

  • Take a bowl and fill 1/3rd of it with ice.
  • Add some salt and mix it with the ice.
  • Now, place the hot water container on the ice bowl and leave it for some time. It will cool down due to the ice surrounding and the salt will accelerate the process. Salt on ice can reduce the temperature from 0 °C to as low as -21 °C. By keeping the hot water on the ice bowl, it will eventually reduce the boiled water’s temperature.How to Cool Boiling Water Faster? Methods that Work

ii. Use Metal and Larger Surface

Metal surface has high heat conductivity, and larger space helps faster cooling. To cool the water faster, you can place the water on a metal surface with enough horizontal space.

iii. Stirring Can Help

Stirring brings the hottest liquid from the bottom to the top, accelerating the convection process. It cools the water faster.

iv. Switch on the Fan

High-speed air moving on the water increases the evaporation rate. It eventually leads the water to cool down faster.

Frequently Asked Questions

The content covered all the aspects of the estimated time for cooling boiling water. Yet you may feel like having some questions. The following segments will discuss some common FAQs.

Q: Which surface cools boiling water faster, copper or glass?

The heat conductivity rate of copper is higher than glass. Hence, if you keep boiling water on both copper and glass surfaces, the one on the copper surface will cool faster.

Q: Does the temperature change when you boil water for 15 minutes?

Water starts boiling at 212 degrees F, and once the water reaches this temperature, it fixes. So, no matter how long you boil the water, the extreme temperature will not fluctuate. Prolonged boiling can kill some bacteria and viruses in the water.

Q: Which chemicals can cool water?

Ammonium nitrate, urea, and calcium ammonium nitrate can cool water very fast. These chemicals initiate the endothermic process. Therefore, if you put any of it in the water container, it will cool the water.


Estimating the time for cooling down boiling water is a day-to-day need. Yet we often just go by our assumption without knowing the exact time. The time for cooling down boiling water is hardly constant. Several factors like water volume, surface material, and space will determine the cooling process. But following the above-mentioned steps, you can speed up the process a bit. This content brings out the exact time to cool boiling water and also provides answers to readers’ queries.




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