Grade 5 (age 10-11)

Temperature and Heat

Temperature is a number for how hot or cold something is, based on how fast its particles move. Heat flows from warmer to cooler until both reach the same temperature, called thermal equilibrium. Slide the temperature to speed up the particles, then mix hot and cold water to watch heat settle.

What is Temperature?

Temperature36 C

🌡 What does temperature measure?

①Temperature: a number showing how hot or cold an object is

②Tiny particles (molecules) move faster as temperature rises

③A thermometer is a tool that shows hotness as a number

How Does Heat Move?

Hot Water80 C

Cold Water20 C

🔥 Direction of Heat Flow

①Heat always flows from hot places to cold places

②Mix hot water with cold water → hot cools down, cold warms up

③Given enough time, both reach the same temperature (thermal equilibrium)

Temperature vs Heat

Temperature = how hot/cold / Heat = energy that flows

Temperature is a 'state', heat is 'movement'

💡 Easily Confused: Temperature and Heat

①Temperature: how hot something is (unit: C)

②Heat: energy moving from hot to cold

③Water and milk at same temp — same temp but different heat amounts

④Analogy: Temperature is like "height", heat is like "weight"!

Summary

Core Concept

Heat: hot place -> cold place (until equilibrium)

When temperatures equalize, heat flow stops

🎯 Key Points

①Temperature: a number for how hot/cold an object is

②Heat: energy flowing from high temp to low temp

③Equal temperatures = no more heat flow (equilibrium)

④Red liquid (alcohol) rising in thermometer = higher temperature

⑤Heat and temperature are different concepts!

Examples and Unit Test

Example 1

When you put a cold spoon into hot water, which way does heat move?

Heat always moves from the hotter object to the colder object.

So heat moves from the hot water to the cold spoon.

▸ From the hot water to the cold spoon

Heat always flows from hot to cold until the temperatures are equal.

Example 2

If you mix hot water and cold water, what happens after a while, and what is this state called?

Heat moves from the hot water to the cold water, cooling one and warming the other.

After enough time, both reach the same temperature; this is called thermal equilibrium.

▸ Both reach the same temperature / thermal equilibrium

At thermal equilibrium the temperatures are equal and heat stops moving.

Unit-test style

Which statement about temperature and heat is correct?

①Heat moves from a colder place to a hotter place

②The higher the temperature, the faster the molecules of an object move

③Temperature and heat are exactly the same thing

④Heat keeps moving even after two objects reach the same temperature

⑤Heat is the energy held by the colder object

▸ ② The higher the temperature, the faster the molecules of an object move

Temperature reflects how fast an object's molecules move; a higher temperature means faster motion.

Heat moves hot → cold (①), temperature is a state while heat is moving energy (③), heat stops at thermal equilibrium (④), and heat is energy in transit, not held by the cold object (⑤).

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