W6

Learning Area Science Grade Level 7

Quarter Third / 3rd Date

I. LESSON TITLE HEAT TRANSFER

II. MOST ESSENTIAL LEARNING
Differentiate between heat and temperature at the molecular level.
COMPETENCIES (MELCs)
III. CONTENT/CORE CONTENT Unit 3 Energy in Motion: Module 5 – Heat
Heat and temperature, and the effects of heat on the body.

Suggested
IV. LEARNING PHASES Learning Activities
Timeframe
Activity 1: Think Out Loud
A. Introduction Day 1
Have you ever wondered how objects become colder or warmer? Analyze
the picture below and answer the questions that follows after it on your paper:

1. What do you think will happen to the pan on top of the stove?
2. What do you think will happen to the metal spoon if the boy leaves it
in the pan? Why do you think it happened?

B. Development Day 1 All objects possess energy which exists in different forms. Although
we cannot hold or touch it, energy could help us explain how and
why things behave the way they do.

We often classify objects as cool or warm, oftentimes by using our sense of

touch (hand, skin) or with the help of a thermometer. This phenomenon is a
result of a process known as “heat transfer”. To fully understand this concept,
study the terms listed below:

• Thermal energy (heat energy) is a type of energy stored in an object or

system that depends on the motion of particles or atom. When the
particles of matter move fast, it increases the thermal energy inside it. But
when the particles of matter move slow, it decreases its thermal energy.

• Temperature measures the amount of thermal energy or degree of

hotness and coldness of an object or system.

• Heat is the transfer of thermal energy from a body with a higher

temperature to a body with lower temperature.

• Heat transfer is the transfer of heat to different medium or forms of

matter.

Using the following terms, let us go back and explain our previous example:
All objects contain energy. The fire possesses thermal energy. As the fire
touches the pot, its energy makes the atoms (inside the pot) move faster,
increasing its thermal energy. As particles move from slow to active, the
temperature of the pot increases (from cool to hot). The transfer of the
thermal energy from the fire to the pot is called heat and the overall process
is known as heat transfer. This process also explains why the soup inside the
pot becomes hot, as well the spoon that is left sitting in the soup.

When thermal energy is transferred, the warmer object cools down and the
cooler object warms up until both objects attain the same temperature,
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IV. LEARNING PHASES Learning Activities
Timeframe
then heat transfer stops. Heat, just like all forms of energy is measured in a
unit called, Joules.

Day 2 The process of heat transfer can happen in three ways, these are:
Radiation is the heat transfer by electromagnetic waves through
space. It does not require the interaction between matter.
Example:
 The heat from the Sun warms the different parts of the Earth.
 You can feel the heat from the sun even if you cannot touch it.

Conduction is the heat transfer between objects (usually solids) or

particles that are directly in contact of each other where one
object’s temperature rises.
Example:
 The heat from the fire is transferred to the pot. The heat from the pot is
transferred into the soup. The heat from the soup is transferred to the
spoon. The heat from the spoon is transferred to your hand as you
touch it.
 Metals and water are good conductor (easily absorbs or allow transfer)
of heat, while paper, cloth and wood are not.

Convection is the heat transfer through fluids (liquids and gases) like
water and air.
Example:
 When air is heated it become less dense (lighter) and float. But when air
is cooled it become denser (heavier) and sinks to the bottom. This is
useful for the hot air balloon. The flame heats the air inside the hot air
balloon allowing it to float. And when heat is reduced, the balloon
starts to sink or move downward.

Going back to our previous example, let us try to identify the type of heat
transfer that occurred in the process.
The heat from the fire is transferred into the pot by radiation, where the
heat travels through waves. The heat from the pot is then transferred into
the soup in the process of conduction, where heat is transferred by direct
contact between materials. When we stir the soup with a spoon or a
ladle, the heat from the soup is transferred into the spoon with the help of
convection, where heat is transferred through the help of fluids. And
when we touch the spoon, we feel the heat from the spoon to our hands
by conduction. But the heat coming from the boiling pot of soup can be
felt even if we do not touch it because of radiation. So, you see, a simple
activity like this involves a lot of process to happen. Isn’t it amazing?

Activity 2: ANALYSIS. Observe each picture or image and classify the type
of heat transfer that happens in each example.

Write the word CONDUCTION, CONVECTION or RADIATION on your paper.

1. You feel the 2. You prepared a
heat from the cup of tea and the
flame without cup feels warm
touching it. when touched.
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IV. LEARNING PHASES Learning Activities
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3. A raw egg 4. The warmth from
begins to fry as it the sun can make
hits the pan. the sand and the
water hot.
5. The food gets 6. The clothes
warm when become flat and
placed in the warm when we
microwave oven. iron it
7. Aircons are placed on high
places because warm air rises and
cool air sinks.

C. Engagement Day 3 Different materials have different ways of absorbing heat. Some objects can
absorb heat fast, some do not. In this task, you will explore different methods
by which heat can be transferred from one material to another.

Activity 3: All at Once

Study the illustration on the right.
Identify the different examples of
situations that involves the different
methods of heat transfer. Take
note that in your chosen situation,
there could be more than one
form of heat transfer involved.
Choose at least 3 examples and
accomplish this task by filling up
the table below.

Copy and complete the table below based on your analysis of the
illustration above.
Table 3: Examples of Heat Transfer

Activity 4: Look Around You

Choose two questions from the given samples and answer it based on what
you have learned about heat transfer.
1. Explain the reason/s why we use cloth for “potholders” or “oven
gloves” when handling pots inside the kitchen?
2. Explain the reason/s why we can feel the heat from sun even we
are inside the house?
3. Explain the reason/s why the water in the beach feels warm during
the night and feels cool during the day?
4. Explain the reason/s why paper burns when touched by fire? Explain
the reason/s why ice melts when we hold it?

C. Assimilation Day 4 At this point, you have learned that heat is the transfer of thermal energy. This
energy is possessed by an object due to the motion of its particles. When
object’s thermal energy increase, its temperature changes from cool to
warmer. When heat is absorbed from one material to another, heat transfer
occurs. This process can happen in three ways: (a) conduction, where heat is
transferred between materials that are in direct contact with each other.
While (b) radiation, occurs when heat is transferred by electromagnetic
waves (through space). And lastly, (c) convection, where heat is transferred
in fluids (like gases and liquids) which making the hot fluids to rise and cold
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IV. LEARNING PHASES Learning Activities
Timeframe
fluids to sink. When heat is absorbed from one material to another, heat
transfer occurs.

REFLECTIVE ACTIVITY
“The Transfer of Heat Energy”
Humans have made great progress with the help of heat. Starting from the
sun, our major source of thermal energy which helps in the regulation of
temperature on Earth, for without it, we will freeze over and life on Earth may
not be possible. Likewise, it is important to understand how heat is
transferred when dealing with materials such as metal, wood, or liquids to
prevent accidents, especially when you work in the kitchen. Knowing the
basics of heat transfer, explain why it is faster to cook a fish using a pan?

V. ASSESSMENT
(Learning Activity Sheets
for Enrichment,
Remediation or
Assessment to be given
on Weeks 3 and 6)
VI. REFLECTION  The learner communicates the explanation of their personal
assessment as indicated in the Learner’s Assessment Card.
 The learner, in their notebook, will write their personal insights about
the lesson using the prompts below.
I understand that ___________________.
I realize that ________________________.
I need to learn more about __________.

Prepared by: MARILYN A. ONGKIKO Checked by: ANTONIO A. PETILOS

REA C. BUNAN
MARIFE A. SIOSON
SHIRLEY FERRERA

References:
Science 7 Learner’s Material published by Department of Education, First Edition 2017. pp. 246 - 256
Dayrit, Lerma L., Science 7 FREED Module. School Divisions of Dasmarinas City, First Edition 2020