The boiling point of a liquid varies according to the applied pressure; the normal boiling point is the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F).
What is the purpose of boiling point?
Boiling point is the temperature at which the vapor pressure of a chemical equals atmospheric pressure. To simply put, it measures the temperature at which a chemical boils. Similar to melting point, a higher boiling point indicates greater inter-molecular forces and therefore less vapour pressure.
What is boiling point short answer?
The boiling point of a substance is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. … A liquid in a partial vacuum has a lower boiling point than when that liquid is at atmospheric pressure.
What is boiling point Class 11?
The temperature at which the vapour pressure of any liquid becomes equal to the atmospheric pressure is known as the boiling point. … The temperature at which the liquid turns into a solid at normal atmospheric pressure is known as the freezing point.
What does boiling point mean in science?
The boiling point of a pure substance is the temperature at which the substance transitions from a liquid to the gaseous phase. At this point, the vapor pressure of the liquid is equal to the applied pressure on the liquid. The boiling point at a pressure of 1 atmosphere is called the normal boiling point.
What is difference between melting point and boiling point?
Melting point: The constant temperature at which a solid changes into liquid is called melting point. … The constant temperature at which a liquid starts changing into gas is called boiling point. Example : boiling point of water is 100°C.
What is difference between evaporation and boiling?
Evaporation is the process where liquid gets converted into vapour. … The major key difference to be noted between Evaporation and boiling is that of the occurrence, Evaporation occurs only on the surface of the liquid whereas Boiling occurs over the large mass of the liquid.