BZU SCIENCE

BZU Science is an amazing blog to explain the scientific concepts in the simplest way. You can find the answers to the conceptual questions of Physics, Chemistry, Math, and Biology.

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Saturday, 21 October 2017

Why Is Milk White


What is milk?

No doubt, milk has become the important component of our diet. There are many benefits of milk. We can use milk to glow our skin, to strengthen our bones and teeth, to rebuild our muscles, to lose weight, and to lower the blood pressure. As we know that milk is a white liquid and it is produced by the mammary glands of the mammals. The milk is the primary source of the nutrition for the newly born mammals because they are not able to digest the other kinds of food.


why milk is white
Why is milk white


Why the color of milk is white?

When we see the color of the milk, then it seems to us white. Now, a question comes to the mind that why is milk white rather than red, yellow, green or blue color. As we know that the color of a material depends upon the properties of the material. Therefore, before going to know about the white color of the milk, we should try to know the composition of the milk.

The composition of the milk?

Generally, the milk is composed of carbohydrate, fat, protein, vitamins, minerals, and enzymes. When we talk about the gross composition of the milk, then we come to know that there is 87.7% water in the milk. Moreover, there is also 4.9% lactose and 3.4% fat in the milk. There are also minerals and proteins in the milk. The composition of minerals in the milk is 0.7% and the composition of proteins is 3.3% in the milk. As we know that we can get milk from a different species like cow, goat, sheep, and buffaloes. The composition of the milk doesn’t remain constant for all the species. This composition of milk varies to some extent from one species to the other species. It is also an interesting to know that this composition of the milk also depends upon the feed of the animals.

What is the phenomenon behind the white color of the milk?

As we know that the color of a material depends upon the properties of the material. This particular composition of the milk allows the milk to reflect all the visible wavelengths of light and there is no visible wavelength of the light is absorbed by the milk. The composition of all the visible wavelengths of the light provides us a white color of the milk.

Why is the cow’s milk yellow?

As we have discussed earlier that the color of a material depends upon the properties of the material. The composition of the cow’s milk is that the fat particles of the cow’s milk contain coloring pigment that is called the Beta-carotene. Whereas, the buffalo’s milk doesn’t contain this coloring pigment. Due to the presence of this coloring pigment, the composition of the cow’s milk is different from the composition of the buffalo’s milk. That’s why the buffalo’s milk is white and the cow’s milk is yellowish.
The 90% of the world’s milk needs are fulfilled with the help of the cow’s milk. First of all, the cow’s milk was drunk over 10,000 years ago in the Afghanistan.




Friday, 20 October 2017

Difference Between Rational and Irrational Numbers

Difference Between Rational and Irrational Numbers

Definition of the Rational numbers
what is the difference between rational and irrational numbers
Rational vs Irrational numbers

In Mathematics, rational numbers are those numbers which are written in the form of p/q such that q≠0.  The condition for the rational numbers is that both p and q should belong to Z and Z is a set of integers. The simplest examples of the rational numbers are given below;
a     a)     1/9
b     b)     10  or 10/1

Definition of irrational numbers

The irrational numbers are those numbers which are not written in the form of the p/q. The simplest examples of the irrational numbers are given below;
a    a)     √3
b    b)      3/0

Difference between rational and irrational numbers

Most of the students are not able to know the difference between the rational and irrational numbers just with the help of their definitions. They require more detail to find the difference between rational and irrational numbers. The key difference between them can explained in the following way;
1    1)      All the perfect squares are the rational numbers and the perfect squares are those numbers which are easily simplified to remove the square roots. The examples of the perfect squares are √ 4, √ 49, √ 324, √ 1089  and √ 1369.
On the other hands, all the Surds are the irrational numbers and the Surds are those numbers which can’t be simplified to remove the square root. The examples of the Surds are √2, √3 and √7.

2   2)     All the repeating decimals are the rational numbers and the repeating decimals are those decimals whose digits repeat over and over again without ending. The examples of the repeating decimals are .33333333, .222222 and .555555.
On the other hand, all the non-repeating decimals are the irrational numbers and the non-repeating numbers are those digits which don’t repeat over and over again. The examples of the non-repeating decimals are .0435623, .3426452 and .908612.

3    3)    The numbers which are written without denominators are rational numbers. The examples of these kind of numbers are 8 and 9. These numbers are written in the form of p/q as 8/1 and 9/1.
The numbers whose denominators are 0 are called the irrational numbers like 8/0 and 9/0.

4   4)    0.5 is called the rational number because it can be written in the form of p/q like 5/10.

5   5)     Pi is the irrational number. Its reason is that it gives us the non-repeating decimal 3.14159……

This is the basic difference between the rational and irrational number.


Tuesday, 26 September 2017

Why we see different colors


We see different colors in this world. When we see different colors in the world, then a question comes to our mind that why we see different colors in the world. The answer to this question is given below;
The color of an object depends upon the properties of the object. A white light of seven colors like violet, blue, cyan, green, yellow, orange and red falls on an object. These seven colors have different wavelengths.

    Why we see the black color?

If all the seven colors of light are absorbed by a material and no color is reflected, then we will see the black color of the material.
Black color
Black color


    Why we see the white color?

If all the seven colors of light are reflected by a material and no color is absorbed, then we will see the white color of the material.
why we see the white color
White color

    Why we see the red color?

If only the red color of the light is reflected by a material and all the other colors are absorbed, then we will see the red color of the material.
why we see the red color
Red color

    Why we see the blue color?

If only the blue color of the light is reflected by a material and all the other colors are absorbed, then we will see the blue color of the material.
why we see the blue color
Blue color

    Why we see the yellow color?

If only the yellow color of the light is reflected by a material and all the other colors are absorbed, then we will see the yellow color of the material.
why we see the yellow color
Yellow color

    Why we see the green color?

If only the green color of the light is reflected by a material and all the other colors are absorbed, then we will see the green color of the material.
why we see the green color
Green color

    Why we see the orange color?

If only the orange color of the light is reflected by a material and all the other colors are absorbed, then we will see the orange color of the material.
why we see the orange color
Orange color

In a similar way, we see numerous colors in the world.





Monday, 25 September 2017

What is the difference between mass and weight


Most of the people think that mass and weight are the same things. The people who think that mass and weight are the same things are wrong. There is a big difference between mass and weight. The difference between mass and weight is given below;

1    1)      Difference in the definitions of mass and weight

difference between mass and weight
Mass and weight

Mass

As we know that each body in the universe is made up of matter. In this way, the quantity of that matter in a specific body is called the mass of that body.

Weight

On the other hand, it is also a reality that Earth attracts everything towards its center with a force. That force is called the Gravitational Force. In this way, weight is the measurement of such force by which the Earth attracts a body towards its center.

      2)      Difference in the type of quantities

As we know that there are two types of quantities. One is the scalar quantity and the second is the vector quantity.

Mass

The mass of a body is a scalar quantity. A scalar quantity is such a quantity which is described only with the help of magnitude and there is no need of direction for its description. For example, 5kg sugar is a scalar quantity.

Weight

On the other hand, weight is a vector quantity. A vector quantity is such a quantity which is described by the magnitude as well as direction. The direction of the weight is always directed towards the center of the Earth. The simplest example of the vector quantity is the Force.

      3)      Difference in the nature of mass and weight

   Mass

The nature of mass is that it remains constant everywhere.

Weight

On the other hand, the nature of weight is different from the mass. Its reason is that weight of a body doesn’t remain constant. It varies from one point to another point.

     4)    

       Mass  

    The mass of a body can’t be zero.

      Weight

On the other hand, the weight of a body can be zero. Its reason is that it depends upon the gravity and gravity can be zero and in this regard, the weight of a body can also be zero.

     5)      Difference in the formulas of mass and weight

       Mass

We use two different formulas to determine the mass and weight of a body. When we are going to measure the mass of a body, then we use the following formula;
F=ma               or              m=F/a    This formula is derived with the help of Newton’s second law of motion.

Weight

On the other hand, when we are going to measure the weight of a body, then we use the following formula;
                     W=mg

     6)      Difference in the measuring instruments of the mass and weight

       Mass

If we want to measure the mass and weight of a body, then it is also necessary for us to use the two different measuring instruments. If we want to measure the mass of a body, then we use the ordinary balance.
Ordinary balance

Weight

On the other hand, if we want to measure the weight of a body, then we use the spring balance.
spring balance for weight
Spring balance

     7)      Difference in the SI units of the mass and weight

      Mass

We use the two different SI units for the mass as well as for the weight. The SI unit for the mass is kg.

Weight

On the other hand, the SI unit for the weight is N.








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