There are several ways to determine if water is boiling:
Visual cues: When water reaches its boiling point, you will see bubbles forming and rising to the surface. As the water boils, these bubbles will break at the surface and release steam.
Auditory cues: As the water starts boiling, you may hear a gentle hissing or bubbling sound caused by the release of steam.
Vigorous movement: Boiling water is characterized by continuous, vigorous bubbling and churning.
Temperature: The boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit) at sea level. You can use a cooking thermometer to check the water's temperature and confirm if it has reached the boiling point.
Visual distortion: As water boils, the appearance of the water surface may change due to the rising steam and bubbles.
Keep in mind that at higher altitudes, the boiling point of water decreases due to reduced atmospheric pressure. Therefore, water may boil at a temperature lower than 100 degrees Celsius at higher elevations.
Always exercise caution when handling boiling water to avoid accidents or burns.