WHAT IS MATTER?
• The object that occupies space and has mass is called matter.
• Everything around us is made up of matter.
For example: chocolate cake, ice, oxygen etc.
• Even, we, the human beings are made up of matter.
• Matter makes up the walls of your house and your classroom.
• Matter is large as well as small.
• So, we can say that objects occupy space.
• But objects have mass too. (Mass is related to how much something weighs.)Read More...
PARTICLE ARRANGEMENT IN MATTER
• In solids, the particles are tightly packed in a rigid pattern and so cannot move away from each other.
Figure 2: Particle arrangement in solid state
• This is why solids generally have a fixed shape.
For example: pen, pencil, wood, bottle, steel, etc.
• A solid has fixed size and shape.
CHANGE OF STATE
• Matter can change from one state to another.
For example, water (liquid) can be changed into steam which is a gas, and ice (solid) can melt and changes into water (liquid).
• These changes depend upon the movement of the tiny particles present in it.
• The process of conversion of liquid into gaseous state is called evaporation.
• This happens because on heating; the particles of water start moving (or vibrating) faster.Read More...
EXPANSION & CONTRACTION
• The process in which the volume of a substance increases with the increase in temperature is termed as expansion.
Figure 6- Electric cables expand in summer season
• Matter increases in volume when there is an increase in temperature.
• The volume increases the most in case of gases.
• When something expands; it takes up more space.
Figure 8- Hot air balloonRead More...