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Subido el 5 de mayo de 2020 por Luis Miguel I.

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Well, sound, light, and today, heat. With this, we finish the explanations of this unit. 00:00:01
So, heat. What is heat? Heat is thermal energy, okay? Sometimes we confuse it with temperature, 00:00:09
but temperature is a measure of this energy. It can be 0 degrees, 10, 20, okay? Here I've got this, 00:00:16
you know look at this okay 36 as a human or 100 when water boils okay this is the measure this 00:00:24
is temperature but heat is the thermal energy okay it can travel in any direction but it always flows 00:00:35
from hot to cold all right from hot to cold and temperature measures how hot or cold something is 00:00:41
the higher the temperature is the faster the molecules move think we here we got a pan 00:00:51
okay the water is cold the molecules are still they are not moving however in a pan when we hit 00:00:57
the water it starts moving the molecules look very fast uh like in like in lights we get two 00:01:06
different types. We get artificial heat sources and natural ones. Okay, artificial 00:01:16
heat sources like electrical energy and chemical energy, they can be transformed 00:01:21
into heat energy. And natural heat sources, imagine life on Earth would not exist 00:01:26
without the heat from the sun, the same as with light. And we also get heat from 00:01:34
inside the Earth called geothermal energy. Remember from last unit we studied 00:01:39
this different type non-renewable or renewable how was it renewable no yes your thermal energy 00:01:44
was a renewable uh type of energy like solar one okay but both types are thermal energy 00:01:51
heat can also change the state of matter you remember what were the states of matter we got 00:02:00
three three solids liquids and gas okay so three possibilities with heats one when solids like 00:02:07
butter and ice are heats they become liquids this is called melting or fusion you got the ice 00:02:17
melting then when liquid water is heats it turns into a gas this is called evaporation think about 00:02:25
the example of before and we were saying if we boil water we heat the temperature 00:02:31
it can evaporate and finally as matter is heat it will expand or get bigger 00:02:36
because the molecules move around more and faster this is called expansion the 00:02:42
best example think about the hot air balloon when we heat the air contained 00:02:49
inside it expands and this is why it's called hot air balloon well that's it 00:02:53
sounds light and heat with this we have finished the explanations of the units 00:03:01
during this week and next one we will be doing activities and practicing these 00:03:07
units so don't worry if you don't understand something but please don't 00:03:13
forget to ask your teachers as many times as you need all right well see you 00:03:16
on Friday bye 00:03:23
Autor/es:
Luis Miguel Isidro Navarro
Subido por:
Luis Miguel I.
Licencia:
Reconocimiento - No comercial - Compartir igual
Visualizaciones:
125
Fecha:
5 de mayo de 2020 - 19:35
Visibilidad:
Público
Duración:
03′ 25″
Relación de aspecto:
1.78:1
Resolución:
1920x1080 píxeles
Tamaño:
122.72 MBytes

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