Properties of Matter · Mati Learning Hub

LESSON 2.1 · SC.3.P.8.1

Temperature

Learning goal: Measure and compare temperatures of solids and liquids.

What to know

Temperature describes how hot or cold a sample is. It is a measurement, not the size of an object.
A thermometer gives a number in degrees. Scientists read the top of the liquid column at eye level and record the scale: degrees Celsius (°C) or degrees Fahrenheit (°F).
The two scales use different numbers for the same temperature. For example, water freezes at about 0°C / 32°F.
Heat moves from a warmer place or object toward a cooler one. A thermometer needs a little time to change until its reading becomes steady.
Compare samples with the same thermometer scale and under the same conditions. Touch can warn us, but it is not a precise measuring tool.

WATCH & NOTICE

What’s Matter?

From Crash Course Kids

Listen for mass, volume, and examples of matter you can observe.

Open video on YouTube ↗

Think like a scientist

Water at 28°C / 82°F is warmer than water at 19°C / 66°F. If a thermometer moves from ice water into sunlight, its reading rises gradually rather than jumping instantly.

INTERACTIVE TEMPERATURE LAB

Follow the warmth from morning to afternoon

Move the time slider or place the thermometer in a sample. Watch the red liquid move gradually, just as a real thermometer needs time to settle.

Temperaturehow hot or cold something isThermometera tool that measures temperature°C and °Ftwo scales for the same temperature

Move from sunrise to afternoon 8:00 AM

18°C / 64°F

The morning air is cool. As sunlight warms the surroundings, both scale readings rise.

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LESSON 2.2 · SC.3.P.8.2

Mass and Volume

Learning goal: Measure and compare the mass and volume of solids and liquids.

What to know

Mass tells how much matter is in an object. A balance compares mass, and grams (g) or kilograms (kg) are common units.
Volume tells how much space matter takes up. Solids may be measured in cubic units, while liquid volume is often measured in milliliters (mL) or liters (L).
Mass and volume are different properties. A small, dense object can have the same mass as a much larger pile of a less-dense material.
One kilogram of feathers and one kilogram of iron have exactly the same mass. The feathers usually need much more space, so their volume is greater.

WATCH & NOTICE

What’s Matter?

From Crash Course Kids

Listen for mass, volume, and examples of matter you can observe.

Open video on YouTube ↗

Think like a scientist

A balance stays level with 1 kg of iron on one side and 1 kg of feathers on the other. The feather pile looks larger, but both sides have equal mass.

MASS & VOLUME LAB

Same mass can take up different space

Add or remove material and read the scale. Iron pieces add mass quickly in a compact space; fluffy feather bundles add less mass each and fill more space.

Masshow much matter is presentVolumehow much space it takes upBalancea tool that compares mass

Scale reading0 g0 space units

The 1 kilogram truth

10 feather bundles = 1 kgmany light bundles · larger volume

2 iron balls = 1 kgfew heavy balls · smaller volume

The balance is level: the ten feather bundles and two iron balls each total exactly 1 kg. Each bundle is lighter than each ball, so more feather bundles are needed. Once both totals reach 1 kg, neither side is lighter—the feathers simply occupy more space.

Model key: each feather symbol represents one 100 g bundle; each iron ball represents 500 g.

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LESSON 2.3 · SC.3.P.8.3

Observable Properties

Learning goal: Compare and classify materials by observable properties.

What to know

Observable properties are features we can safely notice or measure, including color, size, shape, texture, hardness, flexibility, temperature, mass, and volume.
Scientists use precise descriptions: smooth or rough, hard or soft, flexible or rigid, shiny or dull, magnetic or nonmagnetic.
One object has many properties, and two objects can share one property while differing in another.
A useful classification rule states exactly which property is being tested and is applied the same way to every item. An inference is an idea based on observations, not a property observed directly.

WATCH & NOTICE

What’s Matter?

From Crash Course Kids

Listen for mass, volume, and examples of matter you can observe.

Open video on YouTube ↗

Think like a scientist

Observation: a spoon is smooth, shiny, rigid, and attracted to a magnet. Inference: it may contain iron or steel. The first sentence records testable properties; the second uses them to form an idea.

OBSERVATION LAB

Describe first. Then classify.

Select an object to inspect its observable properties. A scientific observation says what you detect or measure—not what you guess.

OBSERVATIONS

Pebble

hardroughrigiddullnot magnetic

Good science sentence

“The pebble is hard, rough, rigid, dull, and is not attracted to a magnet.”

An idea about what kind of rock it is would be an inference.

Try a fair sorting rule: “Place every flexible object in Group A and every rigid object in Group B.” Test each object in the same way. Sorting by “things I like” is an opinion, not an observable-property rule.

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What to know

What’s Matter?

Think like a scientist

Follow the warmth from morning to afternoon

What to know

What’s Matter?

Think like a scientist

Same mass can take up different space

The 1 kilogram truth

What to know

What’s Matter?

Think like a scientist

Describe first. Then classify.

Pebble

Unit 2 benchmark map