Glassblowing | Grade 6 | Unit 2 - Concept 1 - Lesson 1 | Science

شرح ساينس الصف السادس الابتدائي لغات - الفصل الدراسي الأول
شرح ساينس سادسة ابتدائي - ترم أول
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In This Lesson:
• The opposite picture shows a hot spring which is formed as follows:
Ground water is heated by molten rocks which are found deep in Earth, then this water rises to the surface of Earth and begins to boil.
The boiling water in the hot spring changes into steam which is the gas state of water.
How are changes in thermal energy, heat transfer and temperature related to particles in matter?
Thermal energy depends on the movement of particles of matter, where in the water of the hot spring:
When the water is heated, its particles move faster and transfer thermal energy between each other in the form of heat.
When the thermal energy of particles increases this leads to a change in the temperature .
Glassblowing:
▌When the glass (solid state) is heated at very high temperatures, it changes into molten glass (liquid state).
▌Glassblowing is a process to form different shapes of glassware by using a hollow tube contains molten glass at one end of its end.
▌The molten glass could be blown by a person from the open end of the hollow tube and he could make different shapes of molten glass.
▌Then, the molten glass is cooled forming different shapes of glassware.
 
▌Everything around us is made of matter.
▌Matter can change from one state into another.
▌All matter is made of particles called atoms and molecules
Solids Liquids Gases
Shape and volume:
They are substances that have fixed shape and volume.
They are substances that have fixed volume and variable shape.
They are substances that have variable shape and volume.
Molecules
Their molecules are held together tightly in their positions.
Their molecules vibrate around their places . Their molecules are held together more loosely than molecules of solids.
Their molecules move faster than solids and
slide over each other.
Their molecules are not
held together as they are much more loosely than
molecules of liquids.
Their molecules move
independently in all
directions.
Thermal energy in states of matter:
• All matter contains thermal energy.
• The transfer of thermal energy is called heat.
let's study how much thermal energy in different states of matter.
Solids Liquids Gases
Particles of solid matter
move slowly, so they have the least thermal energy. Particles of liquid matter move more faster, so they have moderate thermal energy. Particles of gas matter move very fast, so they have the most thermal energy.
Example: Ice cubes. Example: Water Example: Steam.
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