The boiling point of water in a closed container is 100 degrees Celsius or 212 degrees Fahrenheit. This is the temperature at which water changes from a liquid to a gas.
The boiling point of water in a closed container is higher than in an open container because the pressure inside the closed container is higher. This increased pressure affects the temperature at which water can boil.
As altitude increases, the atmospheric pressure decreases. This means that the boiling point of water in a closed container will also decrease. For every 500 feet increase in altitude, the boiling point of water decreases by about 0.5 degrees Celsius.
If the pressure inside a closed container is higher than atmospheric pressure, the boiling point of water will also increase. This is why pressure cookers are able to cook food faster at higher temperatures.
The boiling point of water in a closed container can be measured using a thermometer. The thermometer is placed inside the container and the temperature is monitored until the water starts to boil. The temperature at which this occurs is the boiling point.