Please talk about various unit conversions (length, weight, area, etc.) in life. ? )

One foot = 10 foot 1 foot = 10 inch 1 inch = 3.33 cm. ...

In Shang Dynasty, one foot was 16.95cm. According to this amount, people were about ten feet tall, so they were called "husbands".

One foot in the Zhou Dynasty was 23. 1 cm;

One foot in Qin dynasty was about 23.1cm;

In the Han Dynasty, one foot was about 2 1.35-23.75 cm.

Three Kingdoms, one foot is 24.2 cm today;

Southern dynasties, one foot is about 25.8 cm;

Northern Wei Dynasty, one foot is 30.9 cm;

One foot 29.6 cm in Sui Dynasty;

One foot 30.7 cm in the Tang Dynasty;

During the Song and Yuan Dynasties, one foot was 3 1.68 cm;

Woodworking in Ming and Qing dynasties was 3 1. 1cm.

■ Data 2: How long did the ancient rulers last?

Rulers exist in ancient and modern times, but the quantity (actual length) is different. For example, the article "Zou Ji satirizes the king of Qi and can be remonstrated" says: "Zou Ji has repaired more than eight feet." According to today's ruler, Zou Ji's body length is more than 2.66 meters, which is obviously too high.

Obviously, the ancient ruler is shorter than today's ruler. The original ruler refers to the distance between a man's thumb and middle finger, which is about 20 cm, so one foot in the Zhou Dynasty is equivalent to the current 19.438+0 cm. Rulers will generally be longer in the future. By the Warring States period, one foot was roughly equivalent to about 23 centimeters now, but at that time, countries were not completely consistent. For example, the ruler unearthed in Chu during the Warring States Period is 22.7 cm long. Zou Ji mentioned earlier was a native of Qi during the Warring States Period. If one foot is 23 cm, his height is above 1.84 meters, which is high even today. In Chen Qingbiao, there is a boy who is five feet tall and won't open the door. The author Shi Mi is from the Western Jin Dynasty. At that time, one foot was equivalent to 24 centimeters now, so a boy who was five feet tall was a boy with a height of 1.2 meters. "Five feet" can also follow the saying of the previous generation, instead of strictly following the law of gold, so it will be shortened a little on the basis of 1.2 meters, that is, 1. 1 meter or so.

Closer to the ruler is wisdom. It refers to the distance from the thumb to the middle finger after the woman's hand is straightened, so it is slightly shorter than the ruler. Later, it was used together to mean short distance, such as "close at hand"

Besides Xi 'an, the units of length in the pre-Qin period included Zhang (ten feet), Xun (eight feet) and Chang (two mou). This is the length of a person's outstretched arms. For example, in "One Mountain in Gong Yu", there are: "Taihang Mountain and Prince of Wu are 700 miles square and high in Wan Ren."

Later, units of length less than one inch were produced, namely: minute (one tenth of an inch), centimeter (one tenth of an inch), milli (one tenth of a centimeter), second (also called "silk" after the Song Dynasty, one tenth of a milli), sudden (one tenth of a second) and micro (one tenth of a second). Today, the usage of "silk" and "milli" comes from this.

There is also the use of "Hu" and "Wei", which also means that it is extremely subtle. For example, in Biography of Lingguan, "The misfortune of a husband often accumulates in small things".

Inch, length unit,110 foot is one inch. In ancient times, the standards of measuring length units were different, and the specific values of inches were also different.

A little tired, even inch by inch, and then become a horse. -Biography of Women in the Later Han Dynasty

Metric Unit Conversion in System Age (cm cm)

Quotient 1 ft = 10 inch, 1 inch = 10 point.

1 ft = 15.8, 1 inch = 1.58.

Warring States 1 ft = 1 ft, 1 ft = 10 inch,1inch = 10 minute.

1 ft = 23 1, 1 ft = 23. 1, 1 inch =2.3 1, 1 point = 0.23 1.

Qin 1 citation = 10 foot, 1 foot, 1 foot = 10 inch, 1 inch = 10 minute.

1 citation = 23 10, 1 Zhang = 23 1, 1 foot = 23. 1, 1 inch = 2.3 1.

Han 1 citation = 10 Zhang, 1 Zhang = 10 foot, 1 0 inch, 1 0 inch = 10 minute/. 1 ft = 23. 1, 1 inch = 2.3 1, 1 point = 0.23 1.

The reflection 1 ft = 1 ft, 1 ft = 10 inch,1inch = 10 minute.

1 foot = 242, 1 foot = 24.2, 1 inch = 2.42, 1 point = 0.242.

Western Jin Dynasty 1 ft = 1 ft, 1 ft = 10 inch,1inch = 10 minute.

1 foot = 242, 1 foot = 24.2, 1 inch = 2.42, 1 point = 0.242.

Sixteen countries in the Eastern Jin Dynasty 1 foot = 1 foot, 1 foot =1inch,1inch = 10 minute.

1 foot = 245, 1 foot = 24.5, 1 inch = 2.45, 1 point = 0.245.

Southern and Northern Dynasties 10 foot = 10 foot, 10 foot = 10 inch, 1 inch = 10 minute.

Southern dynasties:

1 foot = 245, 1 foot = 24.5, 1 inch = 2.45, 1 point = 0.245.

Northern dynasties:

1 foot = 296, 1 foot = 29.6, 1 inch = 2.96, 1 point = 0.296.

Sui 1 ft = 1 ft, 1 ft = 10 inch,1inch = 10 minute.

1 foot = 296, 1 foot = 29.6, 1 inch = 2.96, 1 point = 0.296.

the Tang Dynasty

1 foot = 1 foot, 1 foot = 10 inch,1inch = 10 minute.

Feet: 1 foot = 300, 1 foot = 30, 1 inch = 3, 1 minute = 0.3.

Large scale: 1 foot = 360, 1 foot = 36, 1 inch = 3.6, 1 point = 0.36.

Song and Yuan Dynasties 1 ft = 1 ft, 1 ft = 10 inch,1inch = 10 minute.

1 ft = 3 12, 1 ft = 3 1.2, 1 inch = 3. 12, 1 point = 0.3/kloc-.

Ming 1 ft = 1 ft, 1 ft = 10 inch,1inch = 10 minute.

Tailor: 1 foot = 34, 1 inch = 3.4.

Ruler: 1 foot = 32.7, 1 inch = 3.27.

Building scale: 1 foot = 32, 1 inch = 3.2.

Clear 1 ft = 1 ft, 1 ft = 10 inch,1inch = 10 minute.

Tailor: 1 ft = 355, 1 ft = 35.5, 1 in = 3.55.

Geodetic scale: 1 foot = 345, 1 foot = 34.5, 1 inch = 3.45.

Building scale: 1 ft = 320, 1 ft = 32, 1 in = 3.2.

Convert from feet to meters = (feet * 12+ inch) *0.0254 (fixed value)

Convert from feet to centimeters = (feet * 12+ inches) *2.54 (fixed value)

English units and other equivalent units

Length 1 inch = 2.5400 cm.

1 ft = 12 inch = 0.3048m.

1 yard = 3 feet = 0.9 144 meters.

1 mile = 1760 yard = 1.6093 km.

Area 1 square inch = 6.455438+06 square centimeters.

1 square yard = 9 square feet = 0.836 1 square meter

1 mu = 4840 square yards = 4046.86 square meters.

1 square mile = 640 acres = 259.0 hectares

Capacity 1 cubic inch = 16.387 cubic centimeter.

1 cubic yard = 27 cubic feet = 0.7646 cubic meters.

American dry weight 1 pint = 0.9689 British pint = 0.5506 liter.

1 Pu ear = 64 pints = 35.238 liters.

American liquid volume 1 pint = 0.8327 British pint = 0.4732 liter.

1 addition = 8 pints = 3.7853 liters

British units 1 pint = 1.032 1 American goods = 0.5683 liter.

1 addition = 8 pints = 4.545438+0 liters

1 regular ear = 8 jiahua = 36.369 gong L.

Weight (constant) 1 Angkor = 437.5 ancient = 28.350g.

1 lb = 16 angstrom = 0.4536 kg.

1 medal =100lb = 45.359kg.

1 net weight = 1 12 lb = 50.802 kg.

1 US ton = 2000 lbs = 0.9072 metric ton

1 British ton = 2240 lbs = 1.0 16 1 metric ton.

Metric units and other equivalent units

Length 1 mm = 0.0394 inch.

1 mm = 10 mm = 0.3937 inch.

1 m = 1000 mm = 1.0936 yards.

1 km =1000m = 0.625438+04 miles.

Area 1 mm2 = 100 mm2 = 0. 1550 square inch.

1 square meter = 10000 square centimeter = 1. 1960 square yard.

1 ha =10000m2 = 2.47 1 1 mu.

1 square kilometer = 100 hectare = 0.35438+0 square mile.

Capacity 1 cubic decimeter = 1000 cubic centimeter = 0.06 10 cubic inch.

1 m3 = 1000 cubic decimeter = 0.353 cubic foot.

1 m3 = 1000 cubic decimeter = 1.3079 cubic yard.

1 l = 0.2642 megalun.

1 liter = 0.2200 gallon.

1 hectolitre = 2.8378 Mapel

1 hectolitre =100kiloliter = 2.7497 inpur.

Weight 1 mg = 0.0 154 valley

1 g = 1000 mg = 0.0353 Ang

1000g =1000g = 2.2046 lbs.

1 metric ton =1000kg = 1. 1023 US tons (short tons)

1 metric ton = 0.9842 metric ton (long ton)

Common photo sizes, photo specifications (inches) (centimeters) (pixels) Digital camera types

1 inch 2.5*3.5cm 4 13*295

Certificate photo 3.3*2.2 390*260

2 inch 3.5*5.3cm 626*4 13

2 inches smaller (passport) 4.8*3.3cm 567*390

5 inches 12.7*8.9 1200x840 or more1million pixels.

6 inches15.2 *10.21440x960 or more10.3 million pixels.

7-inch 7x517.8 *12.71680x12002 million pixels or more.

8 inch 8x620.3 *15.21920x1440 3 million pixels or more.

10 inch10x8 25.4 * 20.3 2400x19204 million pixels or more.

12 inch12x10 30.5 * 20.3 2500x2000+5 million pixels

15 inch15x10 38.1* 25.4 3000x2000 6 million pixels.

Comparison of photo size and print size (resolution: 300dpi)

Photo size (inches) Print size (centimeters)

10x 15 25.4 x 38. 1

10x 12 25.4x30.5

8x 10 20.3x25.4

6x8 15.2x20.3

5x8 12.7x20.3

5x7 12.7x 17.7

4x6 10. 1x 15.2

3.5x5 8.9x 12.7