Specific heat capacity and Nakdong River: Difference between pages

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The '''Nakdong River''' ('''Rakdong''' when referred from [[North Korea]]) is the longest [[river]] in [[South Korea]], and passes through major cities such as [[Daegu]] and [[Busan]].

==Geography==

'''Specific heat capacity''' (abbreviated '''s''', also called '''specific heat''') is the [[heat]] required to raise the [[temperature]] of 1 [[gram|g]] of a substance by one degree. Actually, this is only an approximation of heat capacity. An approximation is possible becuase measuring the slope ([[derivative]]) of the internal [[energy]] due to random motion of [[atom]]s in a sample as a function of [[temperature]], normalized by dividing by the [[mass]] of the sample, is normally almost linear. The [[SI unit]] for specific heat capacity is ''joule per kilogram per kelvin'' ''(J·kg^-1·K^-1)''. 1 J·kg^-1·K^-1 is identical to 1 m²/(s²·K), which is non-intuitive, but involves only SI base units.

The Nakdong flows from the [[Taebaek Mountains]] to the [[Sea of Japan|East Sea (Sea of Japan)]]. The river originates from the junction of the Cheolamcheon and Hwangjicheon streams in Dongjeom-dong, [[Taebaek]] [[Administrative divisions of South Korea|city]], [[Gangwon]] province. From there to its mouth it winds for about 506 [[kilometer|km]].

Factors that influence heat capacity measurements:

Major tributaries include the [[Yeong River|Yeong]], [[Geumho River|Geumho]], and [[Nam River|Nam]] rivers. Together with its tributaries, the Nakdong drains most of [[North Gyeongsang]] and [[South Gyeongsang]] provinces, along with small portions of [[North Jeolla]], [[South Jeolla]], and [[Gangwon]]. The total [[watershed]] is 23,384 [[square kilometre|km²]].

*The temperature of the substance. For example, measuring the heat capacity of [[water]] produces different results if you start at 20 °C or 60 °C.

*[[Intermolecular force]]s. If a fluid has stronger intermolecular forces (such as [[hydrogen bond]]ing in water) then the heat capacity is likely to be higher.

[[Image:Andong_Bridge.jpg|300px|thumb|Bridge over the Nakdong River, near Andong dam]]

Heat capacity can be measured by using [[calorimetry]].

==History==

==Related concepts==

The Nakdong River has played an important role throughout [[History of Korea|Korean history]]. The river basin has been a favored dwelling-place for as long as people have inhabited the [[Korean peninsula]]. Numerous [[Neolithic]] remains have been found in the valley. When [[Korea]] first enters world history around the [[1st century|first century CE]], the valley is believed to have been inhabited by the [[Byeonhan]] tribes. During the [[Three Kingdoms of Korea|Three Kingdoms period]], the allied states of the [[Gaya]] federation controlled the valley, until they were overrun by [[Silla]] in [[562]]. These states clearly made use of the river's potential for navigation and commerce, operating a thriving trade in [[armor]] and [[weapon]]s with neighboring countries including [[Yamato period]] Japan. Through the Silla, [[Goryeo]], and [[Joseon Dynasty|Joseon]] periods, the river continued to serve as a major transportation corridor in the [[Gyeongsang]] region.

* specific [[melting]] heat

* specific [[heat of vaporization]]

As a barrier to movement, the Nakdong gained sudden prominence during the [[Korean War]]. The southern length of the river formed the western portion of the [[Pusan Perimeter]], which the UN forces fought to maintain during the autumn of [[1950]]. The bridge over the Nakdong at [[Waegwan]] was blown up on [[August 3]], [[1950]] in an effort to prevent [[North Korea]]n forces from advancing on [[Daegu]]. A large number of Korean [[refugee]]s were killed in the explosion. Although some North Korean forces did cross the Nakdong in places, for the most part the river still marks their furthest advance.

== See also ==

==Ecology==

* [[Phase (matter)]]

* [[Heat#Changes of state|Changes of state by heat]]

* [[Latent heat]]

The Nakdong valley includes the largest extant [[wetland]] in South Korea: the [[Upo wetland]] in [[Changnyeong County]], South Gyeongsang. This wetland provides habitat to a large number of rare and [[threatened species]] of mammals, birds, fish and [[invertebrates]]. In the spring and fall, it provides a resting-place for thousands of [[bird migration|migratory birds]], including [[duck|ducks]], [[goose|geese]], and [[crane (bird)|cranes]].

* [[Temperature#Heat capacity|Heat capacity temperature]]

* [[Volumetric heat capacity]]

Despite being home to the bustling [[Port of Busan]], the Nakdong [[estuary]] also provides substantial [[ecology|ecological]] value. Like Upo, it is noted as a stopping-place for migrant birds.

The Nakdong and its tributaries also serve as a major source of [[drinking water]] for the inhabitants of the river basin and others nearby. However, [[water pollution]] due to domestic and agricultural [[wastewater]] remains a serious concern.

==Economic role==

Although all but the southernmost reaches of the Nakdong have ceased to serve as a major commercial waterway, the river continues to feed those dwelling near it, both directly through [[fishing]] and indirectly through [[irrigation]]. Substantial amounts of [[snails]] and [[catfish]] are taken from the waters and used in local cuisine.

Near [[Andong]], a series of massive hydroelectric dams have been constructed, creating a small chain of artificial lakes of which [[Andong Lake]] is the largest. These lakes also support a substantial [[recreation]]al industry. [[Bass fishing]] is especially popular, since the lakes have been artificially stocked with [[bass (fish)|bass]].

== See also ==

*[[Geography of South Korea]]

*[[List of Korea-related topics]]

*[[List of rivers of Asia]]

[[Category:Rivers of Korea]][[Category:North Gyeongsang]] [[Category:South Gyeongsang]] [[Category:Busan]]

[[ja:洛東江]]