Organs” generally refers to specialized body structures made of different tissues that work together to perform specific functions in living organisms.
In humans and many animals, major organs include:
Heart — pumps blood
Lungs — exchange oxygen and carbon dioxide
Brain — controls the nervous system
Liver — processes nutrients and detoxifies substances
The brain is one of the most important organs in the human body.
Helps you think
Stores memories
Controls movement
Helps you learn
Materials can change in different ways. Some changes can be reversed, and some cannot.
A physical change changes the shape, size, or state of a material, but no new material is made.
Examples:
ice melting,
paper folding,
Material properties describe how a substance behaves under different conditions, including its mechanical strength, thermal stability, electrical conductivity, and chemical resistance. These properties determine how materials are selected and used in engineering, construction, electronics, and everyday products.
Mechanical properties
Tensile strength, hardness, toughness, elasticity, ductility, fatigue resistance.
Example: Steel has high tensile strength, while rubber is highly elastic.
Thermal properties
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