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Properties of materials (pg. 64 y 65) 4th grade NATURAL SCIENCES MATTER

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Subido el 15 de abril de 2020 por Beatriz C.

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Maya nos explica las propiedades de los materiales

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the properties of materials. Why is a pan made of metal, but its handle is made of plastic or wood? 00:00:00
Read and think. One, read and find out. A, three basic ways materials can be classified. 00:00:10
B, an example of each. Different materials have different properties. They can be classified by 00:00:19
physical properties, solubility, and by thermal conductivity. Physical properties, hard or soft. 00:00:26
Hard materials are very difficult to scratch or cut easily. Soft materials are scratched or cut 00:00:35
easily. A diamond is a hard material. Chalk is a soft material. Tough or fragile. Tough materials 00:00:42
are very difficult to break. Fragile materials break easily. Steel is a tough material, right, 00:00:54
because it's a really, really thick metal. Glass is a fragile material. We know that because if 00:01:02
we drop a glass, what happens? It breaks. Plastic or elastic. Plastic materials are easy to bend. 00:01:10
And elastic materials go back to their shape after we squash or stretch them. 00:01:18
Polythene is a plastic material. 00:01:25
Sponge is an elastic material. 00:01:28
Right? 00:01:31
Because you can squish a sponge and then it goes back to its original shape after you squish it. 00:01:31
Solubility. 00:01:39
Solubility describes if a material can dissolve in water. 00:01:40
Materials that dissolve are soluble. 00:01:45
Materials that don't dissolve are insoluble. 00:01:48
When you put salt in water and stir, so if you put salt in water and you stir, the salt dissolves. 00:01:52
The salt is thus soluble. 00:02:00
When you put pepper in water and stir, the pepper doesn't dissolve. 00:02:03
Pepper is thus insoluble. 00:02:08
Thermoconductivity. Thermoconductivity describes if a material can get very hot. Materials that can get hot are thermal conductors. Materials that don't get hot are thermal insulators, because they insulate the heat, meaning they keep the heat as opposed to conduct it or release it. 00:02:12
metal is a thermal conductor plastic and wood are thermal insulators the metal gets very hot 00:02:33
so you can iron your clothes the plastic doesn't get hot so you can hold the iron right so it goes 00:02:43
back to the question is why is a pan made of metal but its handle is made of plastic or wood 00:02:50
because you couldn't hold the metal if you didn't have plastic or wood because you would burn 00:02:55
yourself because it's a thermal conductor. Pans are made of metal so that 00:03:01
they can get very hot and cook food. Spatulas are made of wood or plastic so 00:03:06
they don't get hot and you can hold them. 00:03:13
Idioma/s:
en
Idioma/s subtítulos:
en
Autor/es:
Beatriz
Subido por:
Beatriz C.
Licencia:
Reconocimiento - No comercial
Visualizaciones:
90
Fecha:
15 de abril de 2020 - 19:48
Visibilidad:
Clave
Centro:
CP INF-PRI SAN PABLO
Duración:
03′ 18″
Relación de aspecto:
16:9 Es el estándar usado por la televisión de alta definición y en varias pantallas, es ancho y normalmente se le suele llamar panorámico o widescreen, aunque todas las relaciones (a excepción de la 1:1) son widescreen. El ángulo de la diagonal es de 29,36°.
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