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The formation of hot springs, generally speaking, is divided into two kinds: one is the magma inside the earth's crust, or volcanic eruptions accompanied by the production of volcanic activity over the extinct volcano terrain, because of the crustal plate movement of the earth's surface, there is still uncooled magma underneath the ground, will continue to release a large amount of heat energy, due to the concentration of such heat sources of heat, so as long as there is a porous water-bearing rock formations in the vicinity of not only heat into high temperature hot water, but also most of the boil into steam, most of the sulfate springs. Heat will not only become high temperature hot water, but also most of them will boil into steam, mostly sulfate springs. The second is formed by the infiltration cycle of surface water, that is to say, when rainwater falls to the surface, it infiltrates downward and penetrates into the aquifer deep in the earth's crust to form groundwater. (Sandstone, volcanic rocks, etc. are good water-bearing rocks). Groundwater is heated by the geothermal heat below to become hot water, most of the deep hot water contains gases, these gases are mainly carbon dioxide, when the temperature of hot water rises, if there is a dense, impermeable rock layer above to block when the way to go, will make the pressure higher and higher, so that the hot water, steam in a high-pressure state, a fissure that is gushing up, hot water rises the closer the surface of the pressure is gradually reduced due to the gradual reduction of pressure so that the contained gas gradually Expansion, reduce the density of hot water, the expansion of these vapors is more conducive to the rise of hot water, rising hot water and sinking later heated cold water due to the density of different pressures (hydrostatic pressure difference) repeated cycles of convection, in the case of open fissures resistance to water, rising through the fissures gushing out of the surface, hot water can be a continuous stream of gush up to the end of the ground to flow out to form the hot springs

Definition of hot springs. The standards vary slightly from country to country. For example, Japan's hot spring law stipulates that the temperature of hot spring water should be 20 degrees Celsius and a liter of mineral water should contain certain substances, while in Italy and France, it is 21 degrees Celsius, and in Japan and Taiwan, it is 25 degrees Celsius.

The classification of hot springs: carbonate springs, sulfur springs, salt springs, sodium bicarbonate springs, simple springs

Taboos of soaking in the hot springs: First, the space to maintain ventilation, indoor attention to air conditioning. Second, the water temperature to no more than forty degrees Celsius is appropriate, soak time is best not more than ten minutes, ten minutes will be up to rest three minutes, and then down the bath. Third, prone to insomnia, must avoid prolonged immersion in hot springs, otherwise it is easy to lead to mental exuberance. Fourth, drunkenness, fasting and satiety, should not enter the bath, fasting is easy to fatigue. Fifth, after a long journey, intense exercise, should be a little rest before entering the bath. Sixth, pregnant women, children under the age of twelve, should not be immersed in hot springs. Seven, suffering from heart disease, lung disease, hypertension, circulatory disorders and acute infectious diseases, should not soak in hot springs. Eight, do not run in the pool jumping and playing, to prevent falls. Avoid bathing alone in order to prevent outside. Ten, please do not drink the hot spring water

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China's famous hot springs

Huangshan Hot Spring: also known as the "Spirit Spring", "Vermilion Soup Spring It is also known as "Spirit Spring" and "Vermilion Soup Spring", and is also known as "Four Greats" of Huangshan Mountain together with the strange pines, weird rocks and sea of clouds. Spring water quality to contain heavy carbonate-based, water temperature of 40 ℃, four seasons such as soup, transparent turquoise, a poem said: "If the five mountains and Mount Huangshan and, as if owed to record sand a spring." In Mount Huangshan Ziyun Peak, Peach Blossom Stream built next to the hot springs bathroom, for tourists to clean dirt and dust, eliminate fatigue.

Blue Ocean Hot Springs: Located in Hainan Province, it is as early as the Ming Dynasty during the Wanli period on the written record, known as "a stone apart, hot and cold," the blue ocean hot and cold springs and world-famous. By the former Ministry of Mines and Minerals assessment, blue ocean hot springs silicic acid and fluorine content in line with the medical hot mineral water standards, long-term use of hot mineral water bath, both blood and tendons, but also to get rid of diseases and strengthen the body, has now opened up the size of the hot springs prepared for the medicinal baths more than 30 places. Hainan's largest hot spring swimming pool, a pool of hot spring water you can feel "coconut trees and swimming pools, quiet and beautiful scenery compatible", to help you dispel fatigue on the way to add strength, full of vitality.

Mount Lushan hot springs: at the foot of Mount Lushan in Jiangxi Province, the ancient "hole such as around a zhang Xu, boiling springs gushing out of the soup, winter and summer, often hot" records. The water contains a variety of mineral elements, skin diseases, arthritis, women's diseases, bronchitis and other chronic diseases have a good therapeutic effect. The scenic area is beautiful, and there is a fire therapy room and sanatorium, is a resort.

Tangshan Hot Springs: located in Nanjing City, outside the Qilin Gate, Jiangning County, northeast of the average spring water temperature of 44 ℃, up to 60 ℃, the water is clean, containing sulfur, potassium, sodium and other minerals, for skin patients have a certain therapeutic effect. In this hot springs into the bath, beautifully soaked for a while, quite comfortable, relaxed feeling, is really a place of rest for healing.

Anning Hot Springs: located in Yunnan Anning County, northwest of the Mantis River, is known as a resort. Hot springs water quality clean, water temperature of 42 ℃ -45 ℃, the water contains calcium bicarbonate, magnesium, sodium, etc., skin diseases and rheumatism and arthritis patients have a certain therapeutic effect.

Huaqingchi Hot Spring: Located in Lintong County, Shaanxi Province, it is a famous bathing resort with a water temperature of about 42℃, which used to be the bathing place for emperors of the Tang Dynasty. Bai Juyi's words, "Spring cold is given to bathe in Huaqing Pond, and the water of the hot spring is slippery and washes grease," express the extraordinary charm of the hot springs. Nowadays, Huaqing Pond has dozens of palatial buildings and new bathing pools for visitors to wash themselves.

Xifeng Hot Springs: located in Xifeng County, Guizhou, northeast of the Tiantai Temple under the mountain, the spring water 54 ℃ -56 ℃, clean and transparent, steaming hot, the water contains calcium, hydrogen, magnesium, and other mineral elements, treatment of a variety of diseases. Hot springs around the shade of trees, quiet environment, the famous spa team is located in the scenery of the scenic area, known as the ideal rest and recuperation places.

Conghua Hot Springs: Located 75 kilometers away from Guangzhou in the northwest of Conghua County, since ancient times, there is a "good from the warmth of the soup, the first spring in Lingnan," the reputation. There are 12 springs here, the highest water temperature of 71 ℃, the lowest 30 ℃. The spring water contains calcium, magnesium, sodium dioxide and other ingredients, which are effective in treating high blood pressure, arthritis and brain fatigue. The scenery around the hot springs is pleasant and makes visitors stop.