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Solids, Liquids, gases

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Properties of matter
• Occupies / takes space
• Has mass

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Matter can be
Solid, Liquid or Gas

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Properties of Solids
Definite shape and volume
Tight particles

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Properties of liquids
Indefinite shape
Loose particles
But Definite volume

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Properties of gases
Indefinite shape and volume
Very loose particles
The volume can
be compressed

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Measuring mass of matter
Mass balance

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Measuring volume of liquid
Meniscus
Measuring
cylinder

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Measuring volume of
irregular shape object
Volume of rock is … ml.
Volume of rock is 10 ml.
40 ml – 30 ml = 10 ml

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SOUND

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How the sound can be
produced?
• By vibrating an object or material

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How the Sound Travels?
Through Solid
Through Liquid
Through Gas

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Sound can’t travel through
vacuum because ….
• There is no particles that can carry the
vibration

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What is Volume?
How SOFT ( ) or
LOUD ( ) the sound is.

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Volume of sound can be
measured.
Sound level meter
The unit is decibel (dB)

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Volume of sound can be
absorbed / muffled.
Using cotton wool
Carpet on the floor
Ear muffs in airport

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What is Pitch ?
How LOW or HIGH the sound is.
LOW
HIGH

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Pitch in GUITAR
• Higher pitch
• lower pitch
Long string
Short string
• Higher pitch
• lower pitch
Thick string
Thin String

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Pitch in flute / bottle if we blow
Higher pitch lower pitch
Long Air column
Short air column

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Pitch in drum
Lower pitch
Bigger drum
Smaller drum
Higher pitch
Tight drum skin loose drum skin
Lower pitch
Lower pitch