Page 38 - Summary 6 2025
P. 38

Delta Modern Language Schools
Science department
Grade 6
1st term 2024- 2025

          The properties of different states of matter

Solids              Liquids                             Gases

• They are          • They are substances               • They are substances
 substances that     that have fixed volume              that have variable
 have fixed shape    and variable shape.                 shape and volume
 and volume.
                    • Their molecules are               • Their molecules are
• Their molecules    held together more                  not held together as
 are held together   loosely than molecules              they are much more
 tightly in their    of solids.                          loosely than
 positions.                                              molecules of liquids.
                    • Their molecules move
• Their molecules    faster than solids and             • Their molecules
 vibrate around      slide over each other.              move independently
 their places.
                    • They have moderate                 in all directions..
• They have the      thermal energy.
 least thermal                                          • They have the
 energy.                                                  most thermal
                                                          energy.

Thermal energy is the movement of particles of an object.
Kinetic energy is the energy that molecules and atoms of a
substance has due to their motion.
Thermal energy of a substance is the total sum of kinetic energy of
its molecules and atoms.

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