Sound and States of Matter

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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

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• 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 columnShort air column

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Pitch in drum

Lower pitch

Bigger drumSmaller drum

Higher pitch

Tight drum skin loose drum skin

Lower pitch

Lower pitch