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La densidad - Contenido educativo

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Subido el 1 de julio de 2023 por Carlos G.

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Este vídeo fue creado durante el periodo de confinamiento para explicar a mis alumnos lo que es la densidad

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hello there and welcome to science class have you ever wondered why some objects 00:00:00
sink to the bottom while others float in the water and there are others that 00:00:18
float on the surface they go to the top in order to understand why this is 00:00:27
happening we need to know everything about density why this is important and 00:00:34
how can we calculate it open your books and come with me if you want to know 00:00:39
everything about it a material or substance is matter with particular 00:00:45
characteristics plastic wood and glass are examples of materials as you know 00:00:51
materials have mass and volume they also have different properties these 00:01:00
properties differentiate one material from another the density of a material 00:01:07
is the amount of mass in a specific volume we can understand that by looking 00:01:13
at this example these balls are objects made of two different materials in this 00:01:21
case cork and steel they have the same volume because they occupy the same 00:01:30
space they have different mass because steel is heavier than the cork so the 00:01:41
steel ball has got more mass therefore if the volume is the same and the mass 00:01:52
is different the density is going to be different as well because density is the 00:02:02
amount of mass in a specific volume and this is what we need to know don't 00:02:10
forget it density is the amount of mass in a particular volume I want you to 00:02:18
have a look at this example bowling ball has got more mass 10 kilograms than the 00:02:28
soccer ball that has got one kilogram since they have the same volume one 00:02:46
liter we can calculate their densities easily bowling ball density is 10 which 00:02:55
means that is heavier and denser than the soccer ball on the other hand the 00:03:07
soccer ball is less dense than the bowling ball. Now that we know how to 00:03:15
calculate density, you might be asking yourself why is density so important? Why 00:03:39
do we need to know the density of the different objects? Well, pay attention and 00:03:46
you will discover it. We can use density when we cook. We can use density to know 00:03:52
if the material of one object is real or fake and most importantly we use density 00:04:01
to know if an object floats or sinks did you realize that a large log of wood 00:04:10
floated on water but a comparatively smaller piece of rock sank how is this 00:04:24
even possible this is possible because of density the first case the log of 00:04:30
wood floats on water because it has less density than water. However, in the second case, the 00:04:35
piece of rock sinks because it has more density than water. 00:04:46
In a container, the denser liquids go to the bottom, and the less dense liquids go to the 00:04:51
top. Solid objects float in liquid that is denser than the object. If the solid object 00:05:07
is denser it sinks this is called buoyancy according to this if i want to know if this 00:05:15
state sinks or flows i need to know both densities because i have to compare them 00:05:27
so i think we should do a scientific calculation here we can calculate the density of the water 00:05:36
Density is calculated by dividing the mass and the volume. 00:05:44
We calculate the mass using scales and beakers, and we discover that mass is equal to 100 00:05:52
grams. 00:06:00
Divide that by the volume, that is 100 milliliters, and as a result we can say that water density 00:06:02
is 1 gram per milliliter. 00:06:11
block sinks because its density is 2 which is more than the density of the 00:06:19
water and this block floats because its density is 0 which is less than the 00:06:26
density of the water and as you can see here objects can float in the water or 00:06:37
or on the surface of the water depends on the density they have here is a table of densities 00:06:49
of common items including several gases liquids and solids we can learn from it that metals 00:07:04
usually sink cork floats or sugar is denser than water i've seen that you had some problems with 00:07:14
with this exercise and I'm going to try to explain it. 00:07:25
We need to know which substance is denser or less dense than another. 00:07:30
Well there are two ways to find the answers. 00:07:40
The first one is to do the experiment at home which is the best way to learn and the other 00:07:45
one is to look up on the internet and find the density of the liquids well that's all for today 00:07:52
i'll see you on no no no no wait a minute i have something for you 00:08:23
it's a kind of a riddle i'm going to show you a picture and you have to answer to two questions 00:08:30
1. How is this possible? 2. Where is this man? 00:08:37
Have a look. 00:08:46
Subido por:
Carlos G.
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
7
Fecha:
1 de julio de 2023 - 13:11
Visibilidad:
Clave
Centro:
CPR INF-PRI-SEC LOPE DE VEGA
Duración:
09′ 31″
Relación de aspecto:
1.78:1
Resolución:
1280x720 píxeles
Tamaño:
81.45 MBytes

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