Mississippi Science P.7.5B.3
The Standard
- P.7.5B
- Students will demonstrate an understanding about the effects of temperature and pressure on physical state, molecular motion, and molecular interactions.
Ask questions to explain how density of matter (observable in various objects) is affected by a change in heat and/or pressure.
2026 Mississippi College- and Career-Readiness Standards for Science · Organization of Matter and Chemical Interactions
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students ask questions about how warming, cooling, or squeezing matter changes its density. They use observations of volume and the idea that density is mass per volume to explain what happens.
What Mastery Looks Like
- A student asks what happens to the volume of a sealed balloon when it warms. They explain that its air becomes less dense as it expands, while air pressed into a smaller space in a sealed syringe becomes denser.
Common Misconceptions
- Some students think heating adds matter, so warm air must be denser. Others think pressing a syringe removes air, rather than fitting the same air into less space. They may also expect solids to compress as easily as air.
How to Assess It
- Exit ticket: A sealed syringe of air shrinks from 20 mL to 10 mL when pressed, and a sealed balloon expands when warmed. Write a question about each change, then explain what happens to density in each case.
Lesson moves
Ways to Teach It
Cover a syringe tip and press the plunger, then place a balloon-topped bottle in warm and cool water; record volume changes.
Ask, "Why does the balloon expand while the pressed syringe shrinks?" Have partners answer using mass, volume, and density.
Give pairs cards showing equal masses of air in different volumes; have them rank the cards by density and explain their choices.
Show a photo of a weather balloon rising; ask what happens to its gas and density as outside pressure drops.
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Related Standards
- P.3.5
Students will demonstrate an understanding of the physical properties of matter to explain why matter can change states between a solid, liquid, or gas dependen...
- P.3.5.1
Plan and conduct scientific investigations to determine how changes in heat (i.e., an increase or decrease) change matter from one state to another (e.g., melti...
- P.7.5B.2
Use evidence from multiple scientific investigations to communicate the relationships between pressure, volume, density, and temperature of a gas.
- P.7.5B
Students will demonstrate an understanding about the effects of temperature and pressure on physical state, molecular motion, and molecular interactions.
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