MATTER AND ENERGY

2.1 - Physical States of Matter

Matter refers to the substances that make up our universe. When we observe a sample of matter, it can be in any of three different physical states:

• solid,
• liquid,
• gas.

For example, depending on the surrounding temperature and pressure, water can exist as:

• solid ice,
• liquid water,
• gaseous steam.

Let's identify the phase transition processes. Put your mouse over the arrows below to find out the name of the processes involved in each phase transition.

Some materials like dry ice and iodine can undergo phase transition from the solid phase to the gas phase without going through the liquid phase. Put your mouse over the arrows below to find out the name of this phase transition.

Section 3.1
Physical States of Matter ..p52

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