Define boiling point melting point and evaporation.?

Question

Answer

Temperature at which a substance starts boiling is called as boiling point.Temperature at which any solid starts melting is called as melting point.Evaporation is the process of change of state from liquid to gas below it's boiling point..

Answer

The temp. at which a liquid at which a liquid starts to boil is called boiling point of that liquid and the temp. at which a solid changes to liquid state is called melting point of a solid.

Answer

Boiling Point, Melting Point, and Evaporation Explained

Boiling Point:
The boiling point refers to the temperature at which a substance changes from its liquid state to its gaseous state, typically under standard atmospheric pressure. At the boiling point, molecules within the substance gain enough energy to overcome intermolecular forces holding them together, allowing them to escape into the air as gas. The boiling point is considered a physical property of a substance and is unique to each compound.

Melting Point:
The melting point is the temperature at which a solid substance transforms into a liquid state. It is the reverse process of freezing. When a solid is heated to its melting point, the energy supplied breaks the intermolecular forces between particles, causing them to transition from a rigid arrangement to a more fluid-like state. Like the boiling point, the melting point is also a physical property specific to each substance.

Evaporation:
Evaporation is a process by which a liquid substance changes into a gas or vapor state at temperatures below its boiling point. Unlike boiling, which occurs throughout the entire liquid, evaporation happens only at the liquid's surface. Evaporation occurs due to the energy provided by heat, causing the liquid molecules to gain sufficient kinetic energy to escape the surface and enter the air as vapor. Factors such as temperature, surface area, and humidity influence the rate of evaporation.

The Key Points:
- Boiling point is the temperature at which a substance changes from liquid to gas under standard atmospheric pressure.
- Melting point is the temperature at which a solid substance changes into a liquid state.
- Evaporation is the process of a liquid substance changing into a gas or vapor state below its boiling point.
- Boiling occurs throughout the entire liquid, while evaporation takes place only at the liquid's surface.
- Boiling and evaporation are both influenced by temperature, but boiling requires reaching a specific temperature while evaporation can occur at any temperature.
- The boiling and melting points are unique physical properties of substances and can be used to identify and characterize different compounds.
- The boiling and melting points can vary depending on the purity of the substance, the presence of impurities, and the pressure conditions.
- Both boiling and melting points are useful in various fields such as chemistry, biology, and materials science for understanding and manipulating different substances.

Similar Class 9 Doubts

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