KRT 3013 TEKNOLOGI MAKLUMAT SEKOLAH RENDAH

Unit 7 Heat

Nama : LEE CHOUI YEE

ELA12（ UPSI）

HEAT

Heat is a form of energy that cannot be seen

but can be felt in matter.

Heat is the amount of energy in a matter

that make feel hot or cold.

The SourcesOf Heat

Electricity

Rubbing or Friction

Burning

Sun

The SourcesOf Heat

HOW DO WE MEASUREHEAT ?

A thermometer is used to measure how hot or how cold a substances.

Temperature is a measurement of how hot or how cold a things is.

The metric unit for temperature is degree Celsius (◦ C).

The types of thermometer

Mercury thermometer

Alcohol thermometer

The types of thermometer

• The normal temperature of human body is 37 ◦ C.

Clinical thermometer

Digital clinical thermometer

Measure temperature with correct technique (Graphic)

1. Hold the thermometer upright at the upper stem not at the bulb.

2. Immerse the bulb in the water without touching the beaker. Take the reading of the temperature when the liquid level stop rising or falling.

3. Place your eyes at the same level as the liquid inside the thermometer. Read the marking on the thermometer at the meniscus of the liquid.

Rise or Fall (Experiment)

• Aim of experiment：• To measure the temperature of water when it

is heated and cooled. Apparatus: lighter, lab gas, water, wire gauze, glass rod, retort stand and clamp, 250 ml water, stop watch, tripod stand, thermometer, glass rod.

What do I do?

• Method of experiment:1. Set up the apparatus as shown in the picture.2. Use the thermometer to measure the

temperature of the water.3. Start the stopwatch and heat the water at the

same time.4. Stir the water using a glass rod.

What do I do?

5. Measure the temperature every 2 minutes.6. Record your observations in the table as

shown.7. Turn off the labgas and start your stop watch

at the same time.8. Measure the temperature every 2 minutes for

10 minutes.9. Record your observation in the table.

Table Time (min) 0 2 4 6 8 10

Temperature of water when heated(◦ c)

Temperature of water when cooled (◦ c )

Graph

0 2 4 6 8 10 Time (min)0

10

20

30

40

50

60

70

80

90

100

Temperature(heated)Temperature cooled

Questions

1. How does the temperature change when water is heated?

• Increase, the waters gains heat when heated

2. How does the temperature change when water is cooled? Why?

• Decreases, the water loses heat when cooled

Conclusion1. When water is heated, it ___________ heat

and its temperature ________________ .

2. When water is cooled, it _____________ heat

and its temperature ______________.

gains loses decreases increases

Let to sing and memory:

Heat is a type energy, Thermometer use to measure temperature,When water is heated, it gains heat, temperature increases.When water is cooled, it loses heat, temperature decreases.I love to learn concept science,Heat makes temperature rise and fall.

ExerciseTime

(minutes) 0 5 10 15

Tempe-rature (◦ C) 25 27 31 37

a. How does the temperature of the cooking oil change when it is heated?

_____________b. In this investigation, the

things you:i. Change is:____________ii. Keep the same are ______

and _________iii. Observe is _________

1. 500 ml of cooking oil is heated in a beaker for 30 minutes. The temperature is recorded every 5 minutes as shown in the above table.

Thank you