This document discusses heat and temperature. It defines heat as a form of energy that cannot be seen but can be felt, and temperature as a measurement of how hot or cold something is. It describes different types of thermometers used to measure temperature, such as mercury and alcohol thermometers, and explains how to correctly measure temperature using a thermometer. An experiment is described where the temperature of water is measured as it is heated and cooled over time, showing that temperature increases with heating as the water gains heat, and decreases with cooling as the water loses heat.

1. Unit 7 Heat
Nama : LEE CHOUI YEE
ELA12（UPSI）

2. 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.

4. 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).

5. The types of thermometer
Mercury
thermometer
Alcohol
thermometer

6. The types of thermometer
• The normal temperature of human body is
37 ◦ C.
Clinical
thermometer
Digital clinical
thermometer

7. 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.

8. 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.

9. 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.

10. 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.

11. Table
Time (min) 0 2 4 6 8 10
Temperature of water
when heated(◦ c)
Temperature of water
when cooled (◦ c )

12. Graph
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10 Time (min)
Temperature(heated)
Temperature cooled

13. 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

14. Conclusion
1. When water is heated, it ___________ heat
and its temperature ________________ .
2. When water is cooled, it _____________ heat
and its temperature ______________.
gains loses decreases increases

15. 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.

16. Exercise
Time
(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.

17. Thank you