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from solid to liquid
from solid to liquid
from liquid to gas
from liquid to gas
As we saw before, evaporation and boiling are two different concepts:
Evaporation is when the surface of a liquid changes to a gas at any temperature.
Boiling, however, is when the whole liquid changes to a gas at a specific temperature.
HEATING CURVE
HEATING CURVE
A heating graph shows the time and temperature of a substance when it is changing its state.
The heating graph is a very useful tool because it helps us know the temperature limits where one state of matter is stable.
These graphs have two main parts:
Sloped lines: These lines show how much the temperature changes. This means the substance is in one state of matter (like only solid or only liquid).
Horizontal lines: These are areas where the temperature stays the same (constant temperature). Therefore, a change of state is happening: there is a transition between two states.
EXAMPLE
EXAMPLE
Here, you can see the heating graph for ethanol.
In what temperature range does the ethanol stay in a liquid state?
What is the boiling point (boiling temperature) of ethanol?
On the graph, label the areas where you will find the solid state, the liquid state, and the gaseous state (gas).
What is the melting point (melting temperature) of ethanol?
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