A 40 cm piece of hair weighs about that

A person's 40 cm hair is about a pound.

Since the amount of hair is already determined at birth, hair loss is not gained. The average person's hair grows about 15-20 centimeters per year and weighs about 50 grams.

Most hair growth cycles take 3 to 5 years, when it expires and falls out, and after 3 months of rest, the hair follicles "sprout" again. The rate of hair growth is millimeters per day.

The average weight of a single hair is 100 grams. The weight of long hair is determined according to the amount and length of hair, and the weight of an adult's long hair is about two taels. A person's 40 cm hair is about a pound.

Nature of Hair:

1) The main component of hair is keratin, which accounts for about 97%, and keratin is made up of amino acids.

composition. 2) Oriental hair is coarse and black, hard and heavy, because it contains more carbon and hydrogen particles, so the color is dark. Western hair is light and soft, and its color is lighter because it contains less hydrocarbon.

3) The keratin that makes up the hair epidermis.

It is composed of 20 kinds of amino acids arranged vertically.

4) Structure of the hair: Each hair is composed of the epidermal scales, cortical layer, and medullary layer. The epidermal scale layer is the outermost layer of the hair and usually consists of 2 or 4 layers of scales.

The epidermis is usually translucent or colorless, so it allows natural hair color to shine through; The cortical layer makes up 80% of the hair, where the natural pigment is deposited, and the natural hair color is presented.

A 40 cm hair weighs about 3-5 taels.

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How much is hair about 40 cm long worth?

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Hair about 40 cm long is worth about 200 yuan The price of hair is not only measured from the length, but also depends on the quality of the hair and the amount of hair. If Qing Wangchong has good hair quality and a lot of hair, 40 cm of hair should be able to sell Ling Tsai for about 300 yuan. However, if the hair is rough and dry, and the amount of hair is small.

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50 cm of hair is about half a catty.

Weight is the gravitational pull that an object is subjected to.

The measure, weight and mass of the force after action are different. The unit is kilogram weight. Gravitational pull on Earth.

Weight and mass are equivalent, but the units of measurement are different.

A substance with a mass of 1 kg is subjected to an external force of 1 Newton.

The resulting weight is called 1 kg weight. What exactly does weight mean as a physical concept?

Textbooks have different interpretations and interpretations of this, so there is confusion in its usage. Under the gravitational pull of the Earth, the weight produced by a substance with a mass of 1 kg is Newton.

Hair color is generally genetically determined, and the most common ones are black, blonde, brown and red. When humans age, the hair usually turns silvery-white. Depending on the ethnicity and region, the hair comes in jet-black, golden-yellow, reddish-brown, reddish-brown, yellowish, grayish, and even green and red.

Scientific studies have proven that the color of hair is the same as the metallic elements contained in hair.

The difference is related. Black hair contains equal parts of cleft copper, iron, and melanin.

When the amount of nickel increases, it becomes off-white.

Blonde hair contains titanium, reddish-brown hair contains molybdenum, reddish-brown hair contains cobalt in addition to copper and iron, and green hair contains too much copper. In some African countries, some children have red hair, which is caused by a severe lack of protein.

A hair strand of 1 meter pure segment is considered to be weight=100*mg, and a centimeter of head is a bucket milligram. 50 centimeters is milligrams.