22042020 Good Day everyone I am Mr L R Maleme PLP Foundational Science Lecturer science Today we are going to focus on unit 2.3 Which is heat and temperature The unit has the following topics: (on the student guide) 2.3.2 heat energy Page
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Presentation Transcript
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22/04/2020 Good Day everyone I am Mr L R Maleme PLP Foundational Science Lecturer science<br>
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Today we are going to focus on unit 2.3
Which is heat and temperature
The unit has the following topics: (on the student guide)
2.3.2 heat energy Page 64 for today
2.3.3 Expansion of solids, liquids and gases Pg 66 today
2.3.4 Kinetic energy of matter pg 69
2.3.5 The thermocouple Pg 70
2.3.6 Thermo-conductors and thermo- insulators pg 73<br>
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On the workbook the topic 2.3: heat and energy is on page 52
Activity 2.9 temperature scales (class work and homework) pg 52
Activity 2.10 Convention, conduction and radiation pg 53
Activity 2.11 Expansion (Class work) pg54
Temperature scales: We use different temperature scales in our lives to measure
Read on your student guide Pg: 61 and name a common
Instrument used in the health profession to measure body temperature.<br>
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Make sure you can clearly differentiate/ explain between: ( By definition )
1. Heat and
2. Temperature
Make sure you can clearly differentiate/ explain the difference between
1. Celsius scale
2. Kelvin Scale
And how to convert between the 2<br>
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2. Heat
Introduction:
We use heat in our in daily life’s to cook, warm
ourselves and so forth,
heat is used on page 54 of your study guide to effect a change On water.
go to the page and recap.
And the examples of chemical change caused by heat eg: burning wood or cooking on page
Pg 55.
Read through page 64 – 66 of you student guide for an
intro into heat.<br>
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Now let us do one example of each workbook activity so that we get an idea
how we convert from one scale to the other
the basic is: 0 deg Celsius = 273 kelvin
so 15 deg = 15+273= 288 K
do your workbook exercises on Pg:52 as I
have showed you how to convert<br>
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The next topic is heat
Heat energy:
Here on earth we live by the “Law of the Conservation of Energy. Pg 64 on your student guide:
So where do we get our energy from if we cannot create it ourselves?
All the energy used on this planet comes from the sun. Any source of energy that we can think about,
can be traced back to the process of photosynthesis used by plants to create energy-containing materials
Pg 64 on your student guide<br>
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The last topic to be covered on your student guide and workbook is
Radiation,
conduction
and convection
If you take a pan out of a cupboard, the pan feels cold. If you put cold water in the pan, everything will still feel cold. If you now put the pan over a hot fire, things start to change
Pg 65 on your student guide
The heat from the fire travels through the air is an example of radiation.
The hot water rising up inside the water is spreading heat through the process of convection.
The heat that you can feel in the handle of the pan is spread through the process of conduction.<br>
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Hot air also spreads heat through convection so the air
around or the fire or around a heater or inside an oven also feels hot The heat from the fire that travels through the air is an example of radiation. The hot water rising up inside the water is spreading heat through the process of convection. The heat that you can feel in the handle of the pan is spread through the process of conduction. Hot air also spreads heat through convection so the air around or the fire or around a heater or inside an oven also feels hot
GO to page 53 of your workbook and fill in the table provided based on the above explanation of radiation convection and radiation<br>
