In a vacuum chamber, water boils at a lower temperature compared to its boiling point at atmospheric pressure. The boiling point of water is directly related to the surrounding pressure. When the pressure decreases, as in a vacuum, the boiling point of water decreases as well.
At standard atmospheric pressure, which is around 1 atmosphere (atm) or 101.3 kilopascals (kPa), water boils at 100 degrees Celsius or 212 degrees Fahrenheit.
In a vacuum chamber where the pressure is significantly reduced, the boiling point of water decreases. The exact boiling point in a vacuum chamber depends on the level of vacuum or the pressure inside the chamber.
As an approximate guide, at a pressure of around 1 kPa (kilopascal), which is close to a high vacuum, water boils at approximately 26-27 degrees Celsius or 78-80 degrees Fahrenheit.
However, it's important to note that this is a rough estimation, and the boiling point can vary depending on factors such as impurities in the water and the altitude at which the experiment is conducted.