Cold Warm Occluded Stationary-Types of Weather Fronts

Saturday, November 17, 2018




Types of weather fronts

There are four main types of fronts. Weather fronts occur when large masses of air which has different temperatures interact.
Cold air is denser than warm air and therefore wants to settle below this warmer air.
The warm air moves upwards and cools which may result in rain, sleet, snow, or hail.

Four types of fronts

Cold front: When cold air overtakes warm air

Warm front: When warm air overtakes cold air

Occluded front Warm air gets trapped between cold two cold fronts

Stationary front: Two air masses of similar density meet each other and become stationary

How to change a recurring decimal to a fraction

Thursday, November 15, 2018



How do you convert a recurring decimal into a fraction?
For example, convert .333 to a fraction.
Follow these steps to convert the recurring decimal to a fraction
Step 1:
Set up an equation by setting x equal the repeating decimal you are trying to convert to a fraction.
This is equation one.
Step 2:
Set up a second equation in which the repeating decimal is to the left of the decimal point. This is equation two.
In order to do this, you will have to multiply x by a factor of 10
Step 3:
Subtract equation one from equation 2
Step 4:
Solve for x
Step 5:


Example problems
Example 1. Change .666 to fraction form.
Step 1. X = .6666
Step 2.
In order to have the repeating decimal to the left of the decimal, you need to move the decimal one place to the right.
Remember, what you do to one side of the equation you must perform on both sides.
Multiply both sides by 10
10x = 6.666
Step 3. Subtract equation 1 from equation 2
10x = 6.66
   X = 0.666
____________
9x = 6
Step 4. Solve for x


9x = 6
9   = 9
X = 6/9 which equals ⅔
Example 2
Convert the decimal .1616….. to a fraction
Step 1. X = .1616
Step 2. 10x = 16.1616…
Step 3.
100x = 16.1616
- x   = .1616
____________
99x = 16
Step 4.
99x = 16
99       99
X = 16/99
Step 5
Simplify the fraction
16 / 9 = 2
99/ 9 = 11

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How blood flows through the body

Monday, November 12, 2018



How does your blood flow throughout your body?
The circulatory system is the transportation system of the body and is responsible for the flow of blood in the body. The major structures that make this possible are the heart, blood vessels, and blood.
The heart pumps blood in order to move nutrients oxygen, carbon dioxide disease-fighting white blood cells, and hormones to and from the cells in the body.
The circulatory system has two main types of circulation.

The pulmonary
The Systemic
Pulmonary circulation travels from heart to the lung where your blood picks up oxygen and back to the heart.
Systemic circulation is from the heart to the entire body

Your heart has four chambers that are used to pump blood throughout your body.

Two Atria - which are the upper chambers.
Two ventricles - these are the lower chambers
The left and right side of the heart is divided by the septum

Blood Vessels carry blood throughout the body.
Arteries carry blood away from the heart and veins carry blood towards the heart

Capillaries, which are the smallest blood vessels in the body create a network of vessels connecting veins and arteries.

In summary, the heart pumps blood to the body through the arteries and  returns blood to the Body through the veins

You have around 1.5 gallons of blood in your body
It is composed of several different types of cells.
The first type of blood cell is the red blood cell. Red blood cells help carry oxygen

The second type of blood cell is known as the white blood cell and helps fight pathogens

The third type of cell is the platelet and create blood clots.
These blood cells are found in a liquid called plasma which consists of water along with electrolytes and some proteins and hormones.

The flow of blood through the heart

Blood enters on the right side of the heart from the superior and inferior vena cava. This blood is oxygen-poor because the blood has traveled around the body and the oxygen in the blood has been exchanged for carbon dioxide.
The blood enters the right atria and travels through the tricuspid valve and into the right ventricle.
From this chamber, this oxygen-poor blood travels up the pulmonary artery and into the lungs. Oxygen is exchanged for carbon dioxide and it travels back to the heart full of oxygen.
The blood travels into the left atria and then goes through the mitral valve into the left ventricle.
From the left ventricle, it travels through the aortic valve and out of the aorta and into the entire body.

In summary, The job of the circulatory system is to circulate blood to and from cells in the body in order to transport nutrients and oxygen and remove carbon dioxide and waste.

Additional resources

The flow of blood video

Pathway of blood Quizlet

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LCM and GCF of 9 12 and 15

Sunday, November 11, 2018



The GCF or greatest common factor is the largest positive integer that will divide into each number evenly.

For example, the greatest common factor of 9 and 12 would be 15.

There are several different names for the GCF ( greatest common factor)

  • GCD Greatest Common Denominator
  • HCF Highest Common Factor
  • GCD Greatest Common Divisor
The GCF for 9, 12 and 15 equals 3

The lcm or least common multiple is the smallest positive integer that two or more numbers will divide into evenly. Again, a zero remainder.

Other names for the LCM
  • LCD Least Common Denominator
  • LCD Least Common Divisor
The LCM of 9,12 and 15 = 180

I like to use a factor tree to find the LCM and the GCF

Once you find all of the prime factors of a number, to find the GCF you multiply all of the factors, but multiply duplicates in each number only once.

In order to calculate the LCM you look for factors in each number and multiply these common positive integers together.

In summary,

The Greatest Common Factor, Greatest Common Denominator, Highest Common Factor of
9,12, and 15 = 3

The Least Common Multiple, Least Common Denominator, Least Common Divisor of
9,12, and 15 = 180


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Convection Current Demonstration

Friday, November 9, 2018


Convection currents are the result of uneven heating of water or air. These currents create some of our wind, weather, and ocean currents.
In order to demonstrate convection currents, I first froze blue water into ice cubes. I next used red food coloring to create red water and then heated this water. When I place these objects in the water you can see how the different temperatures of water flow.
The hot water flows upward and the cold blue water flows downward. This flow is due to density difference caused by the difference in temperature. Cold water is denser than warm water.

Materials for this convection current demonstration
Red and blue food coloring
Ice cube tray
Bottle for the hot water
Fish tank or any large clear container

Why do convection currents occur?
Cold water is denser than warm water. As water cools the molecules become packed together more tightly which results in more mass per volume.  Objects that have a greater density than another object will always settle below the less dense object. For example, oil is less dense than water, therefore water will always settle below oil if the two liquids are poured into a container.
The convection current occurs as the water of different densities moves in order to fall above or below objects of different densities. The warm less dense water moves upward because it is less dense than the cold more dense water that moves downward. This resetting of the water creates currents.

Events created by convection currents.

Local winds many times are caused by convection currents. The land heats up and cools down more rapidly than a body of water like the ocean. This difference in temperature creates convection currents which produce sea breezes and land breezes.

Ocean currents are also caused by convection currents. Many of the currents created by convection currents occur below the surface or even deep in the ocean.

Severe weather As a large body of cold air moves into an area of warm air the warm air moves upward quickly and this creates a low-pressure system which may create severe storms.

Convection currents of molten rock in the earth may result in volcanoes and earthquakes.

The movement of tectonic plates occurs because on convection currents.

Additional Videos on Convection Currents

Convection currents crash course
This video revies how convection currents cause ocean currents and wind.

Convection
This video by Teachers Pet reviews how convection currents are created.



Why are cells so small?

Thursday, November 8, 2018


In this video, I use diffusion cubes to show why cells are so small. A small cell with a large surface area to volume ratio can efficiently move materials into the cell.

Diffusion is a type of passive transport that cells use in order to move materials like oxygen and carbon dioxide into and out of the cell. The common phrase used with diffusion is " high to low is the only way to go." Objects will flow from an area of high concentration to an area of low concentration without the use of energy. Cells use diffusion and osmosis in order to move materials like oxygen and glucose into the cell.
A cell with a larger surface area to volume ratio is more efficient at moving material than a cell with a smaller ratio.

How do you calculate the surface area to volume ratio of a rectangle?
First, calculate the surface area of each side ( 6 total) and add these together.
Calculate the volume using length x width x height
Divide surface area by volume.

Here is my recipe for the diffusion blocks
gelatin
Ammonia
Phenolphthalein

The more gelatin you use the more rigid your diffusion blocks will be.

If you soak the diffusion cubes in vinegar then the phenolphthalein will turn pink when it comes in contact with the vinegar which allows you to see the rate of diffusion.
When the vinegar comes in contact with the ammonia a base is created and the Phenolphalein turn pink.
The diffusion cubes are a fun way to watch diffusion occur.

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LCM and GCF of 18 and 24

Wednesday, November 7, 2018




The GCF or greatest common factor is the largest positive integer that will divide into each number evenly. 
For example, the greatest common factor of 2 and 4 would be 2.
There are several different names for the GCF ( greatest common factor)
GCD Greatest Common Denominator
HCF Highest Common Factor
GCD Greatest Common Divisor

The GCF for 18 and 24 equals 6

The lcm or least common multiple is the smallest positive integer that two or more numbers will divide into evenly. Again, a zero remainder.

Other names for the LCM

LCD Least Common Denominator
LCD Least Common Divisor

The LCM of 18 and 24 equals 72

I like to use a factor tree to find the LCM and the GCF

Once you find all of the prime factors of a number, to find the GCF you multiply all of the factors, but multiply duplicates in each number only once.

In order to calculate the LCM you look for factors in each number and multiply these common positive integers together.

In summary,

The Greatest Common Factor, Greatest Common Denominator, Highest Common Factor of
18 and 24 = 6

The Least Common Multiple, Least Common Denominator, Least Common Divisor of 
18 and 24 = 72

MooMooMath and Science upload a new math or science video every day. We have over 1400 math and science videos to help in school and life.
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