Question

Температатура кипения воды 100с.но вода в закрытом котле закипает не при 100с а при гораздо более высокой температуре. В чем причина этого явления

Answer 1

Давление является причиной

Answer 2

The Boiling Point of Water

The boiling point of water is commonly known to be 100 degrees Celsius (°C) at standard atmospheric pressure. However, it is important to note that water can actually boil at temperatures higher than 100°C in a closed container or under conditions of increased pressure. This phenomenon occurs due to a few factors:

1. Pressure: The boiling point of a substance is directly influenced by the pressure exerted on it. At higher pressures, the boiling point of water increases. For example, at higher altitudes where atmospheric pressure is lower, water boils at temperatures below 100°C. Conversely, in a closed container where pressure is increased, the boiling point of water can exceed 100°C.

2. Impurities: Impurities in water, such as dissolved minerals or gases, can also affect its boiling point. These impurities can raise the boiling point of water, making it necessary to reach a higher temperature for it to boil.

3. Superheating: Superheating is a phenomenon where a liquid is heated above its boiling point without actually boiling. This can occur when the water is heated very slowly or when it lacks impurities or nucleation sites that promote boiling. In such cases, the water can reach temperatures above 100°C before suddenly boiling and releasing steam.

It is important to note that the boiling point of water at 100°C is a standard reference point under normal atmospheric conditions. However, in specific situations involving pressure, impurities, or superheating, the boiling point can deviate from this value.