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UNIT 3, image, image, image, image, image, image, image, image, image,…

- - - - Gas
        
        Definition
        
        It has no definite shape. Occupies all the space of the container that contains.
        
        Examples
        
        Air, water vapor, bubbles inside a soda, etc.
        
        Characteristics
        
        It cannot be taken with hands, it's hard to see, but it is possible to feel his presence.
        
        It has no attributes to a simple view.
      - Liquid
        
        Definition
        
        It has no definite shape. It takes the form of a container that contains.
        
        Examples
        
        Water, milk, oil, honey, yogurt, etc.
        
        Characteristics
        
        It can be thick, fluid, or viscous.
        
        It is hard to take with hands, but it can be felt and you can see it easily.
      - Solid
        
        Definition
        
        It has a definite shape.
        
        Examples
        
        Stone, wood, ice, rubber, leather, fabric, etc.
        
        Characteristics
        
        You can feel it, catch it and play easily.
        
        It can be hard, soft, fragile, elastic, rigid, flexible, etc.
- - - - It is the force of attraction that gravity applies to a thing.
      - The weight is measured in Newtons
      - N=m*gravity acceleration (9,81 m/s2)
      - For example: The mass is the same in every picture but the weight changes due to gravity.
    - - It is the quantity of space that a thing occupies.
      - The volume is measured in cubic meters.
      - Most part of the time we use cubic centimeters or liters.
      - There are two containers where the volume of the smallest container has less volume because the same quantity of water is different.
    - - The mass is the quantity of matter that a thing has.
      - The mass is measured in KILOGRAMS.
      - 1 Kg=1000 g
      - For example: We have two different objects on the scales. Each one has a different mass according to the scales.
- - - - When an object is in a liquid, this looks bent because the light changes their direction.
    - - When the light goes through a prism, the light gets decomposed in several colors.
    - - When an object is in front of a polished object the light bounces and reflects the object.
  - - - It allows the light to go through partially. Depends on the object.
    - - It does not allow the light to go through.
    - - It allows the light to go through.
- - - - Heterogenic
        
        At first glance, its components or phases are differentiated. For example: Sand and water.
      - Homogeneous
        
        At first glance, its components are not visible. For example: Air
  - - - They are obtained from nature. They are of animal, mineral, and vegetal origin. Examples: Wool, wood, metal.
    - - They are not from nature, they are obtained from different raw material. Examples: Paper, iron, plastic, pottery.
  - - - Elements
        
        They are represented by chemical symbols, for example: oxygen (O).
      - Compounds
        
        They are substances formed by two or more elements that are in fixed proportions, for example: water is formed by two atoms of hydrogen (H) and one of oxygen (O).