For a beaker of boiling water , the bubbles form when there are enough high energy water molecules , the boiling process depends on the pressure gave on the water and also the place where the kettle is getting boiled as for water the melting point is 100 degrees
Pure substance
A pure substance melts and boils at a particular temperature. Let's look at each liquid's melting or boiling point.
Substance's Physical state at room temperature Melting point Boiling point
Oxygen Gas -219 -183
Nitrogen Gas -210 -196
Water Liquid 0 100
Copper solid 1083 2600
Carbon dioxide gas -78 (a)
A means sublimes at atmospheric pressure means that it becomes gas in our normal atmospheric pressure , if you pour carbon dioxide it will turn into gas , pure substance means a single chemical element. The values of melting down and boiling down are actually predictable and important as it helps in to get a sample of how elements react in certain pressure or temperature, the melting down of a solid can be tested by using an electrically heated melting point
Experimential equipments
The melting point of a solid can be measured using the apparatus , apparatus is an scientific equipment used in labs and experiments.
Melting point observation
Scientist have observed the temperature rises until the metal melts down , closer observations say that the temperature stays constannt until the metal has melted down , the temperature rises when the liquid starts feeling warm.
Apparatus
We can heat the liquid in the same appartus until the boiling point of the liquid has reached and again the temperature stays same until the liquid has evaporated , lets test this through a experiment.
Cool curve of water
When a substance is boiling or heating we could experience a heat curve. When a subtance is cooling or getting cool we could observe a cooling curve.
As you could see the substance is water. Now when water turns into ice