Definition of Boiling Point of Water 

This graph above shows the relationship between the boiling point of water and altitude. At sea level (atmospheric pressure 760 mmHg), water boils at a temperature of 100°C. If the altitude is higher, such as on mountains or hills, the atmospheric pressure is lower, below 760 mmHg, and the boiling point of water will be lower, below 100°C.

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This graph above shows the relationship between the boiling point of water and altitude. At sea level (atmospheric pressure 760 mmHg), water boils at a temperature of 100°C. If the altitude is higher, such as on mountains or hills, the atmospheric pressure is lower, below 760 mmHg, and the boiling point of water will be lower, below 100°C.

To prevent the above issues, the boiling point of water in the radiator should not be affected by external air pressure, and while the engine is running, the pressure (air) inside the radiator must be higher than the external air pressure (differential pressure) so that the boiling point of water rises above 100°C. 

Pressure (tekanan) and preventing a vacuum from forming inside the radiator when the engine cools down. Generally, the pressure inside the radiator is maintained at around 0.75 kg/cm². Antifreeze additives can be added to the cooling system of heavy equipment units, because in addition to lowering the freezing point, they can increase the boiling point.

On the graph, if pressure of 0.75 kg/cm² (differential pressure) is applied above the water, the boiling point of water rises to 115°C at sea level. To ensure that the air pressure inside the radiator is not influenced by atmospheric pressure, the radiator is equipped with a radiator valve, which functions to maintain and limit the differential pressure.

Lokasi: Indonesia

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