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heat

In thermodynamics, heat is a type of energy transfer in which energy flows from a warmer substance or object to a colder one. It can be defined as the total amount of transferred energy excluding any macroscopic work that was done and any transfer of part of the object itself. Transfer of energy as heat can occur through direct contact, through a barrier that is impermeable to matter (as in conduction), by radiation between separated bodies, by way of an intermediate fluid (as in convective circulation), or by a combination of these. By contrast to work, heat involves the stochastic (random) motion of particles (such as atoms or molecules) that is equally distributed among all degrees of freedom, while work is confined to one or more specific degrees of freedom such as those of the center of mass. Since heat (like work) is a quantity of energy being transferred between two bodies by certain processes, neither body "has" a definite amount of heat (much like a body in itself doesn't "have" work). In contrast, a body indeed has properties (state functions) such as temperature and internal energy. Energy exchanged as heat during a given process changes the (internal) energy of each body by equal and opposite amounts. The sign of the quantity of heat indicates the direction of the transfer, for example from system A to system B; negation indicates energy flowing in the opposite direction. Although heat flows spontaneously from a hotter body to a cooler one, it is possible to construct a heat pump or refrigeration system that does work to increase the difference in temperature between two systems. In contrast, a heat engine reduces an existing temperature difference to do work on another system.
Monitor - Computer monitor - the general name of one of the output devices for direct communication between th
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Monitor

Added month ago by Matyszczk

6

nature - beautiful and unique nature
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nature

Added 3 months ago by ala

42

Sunset - colorful jigsaw puzzle
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Sunset

Added year ago by andi

255

Winter scenery - winter colorful puzzle
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Winter scenery

Added year ago by andi

126

Landscape - colorful jigsaw puzzle
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Landscape

Added year ago by andi

121

Windows-10 - colorful jigsaw puzzle
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Windows-10

Added year ago by andi

19

Esplosioneee - eew oooh oho wohq jwpj pd w
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Esplosioneee

Added year ago by djwbiw

78

Tragedy - complicated puzzle
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Tragedy

Added year ago by andi

119

Jigsaw puzzle - a great jigsaw for everyone
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Jigsaw puzzle

Added year ago by andi

10

tropical island - Puzzles show a beautiful tropical island
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tropical island

Added year ago by Julita

604

castle at night - crescent moon over the castle
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castle at night

Added year ago by ewunia x

215

Krajobrazy - Znak ,że nic mi sie nie poprzestawiało!!!???
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Krajobrazy

Added year ago by Marysia

292

Krajobrazy - No i jest następny:):)...Dobranoc..:)
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Krajobrazy

Added over a year ago by Marysia

309

Krajobrazy - Niesamowite zdjęcie...burza w tle erupcja wulkanu!!!!
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Krajobrazy

Added over a year ago by Marysia

302

hallo123 - hallo hallo hallo i jeszcze raz hallo
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hallo123

Added over a year ago by tojakie

4

płonie ognisko - ogien,woda,las,plaża,jezioro
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płonie ognisko

Added over a year ago by wieslawa

82

m jak meffak - no to tera m czyli meffak
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m jak meffak

Added over a year ago by Mef fak

49

wybuch wulkanu - wulkan,lawa,płynąca,wrząca
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wybuch wulkanu

Added over a year ago by wieslawa

143

wybuch wulkanu - skała,wulkan,ogień,otwór,
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wybuch wulkanu

Added over a year ago by wieslawa

152

wybuch wulkanu - wulkan,wybuch,ogień,lawa
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wybuch wulkanu

Added over a year ago by wieslawa

156

płynąca lawa - wybuch,wulkan,skała,żar
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płynąca lawa

Added over a year ago by wieslawa

124

kosze na ognisko - kosze,ogień,woda,las,metal
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kosze na ognisko

Added over a year ago by wieslawa

136

ognisko nad jeziorem - ogień,drzewo,woda,ognisko,płomienie
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ognisko nad jeziorem

Added over a year ago by wieslawa

174

obraz zachód słońca - zachód słońca statek piracki
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obraz zachód słońca

Added over a year ago by Halinka

218

Route 66, USA - Route 66, USA ;)

To jedna z najsłynniejszych dróg świata.
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Route 66, USA

Added over a year ago by Minionek

138

chmura jak..kula ognia - niebo,chmura,obłok,zjawisko
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chmura jak..kula ognia

Added over a year ago by wieslawa

100

niezwykłe obłoki - obłok,niebo,chmura,pomarańczowa
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niezwykłe obłoki

Added over a year ago by wieslawa

48

niezwykłe  chmury - wzgórza,domy,lampy,niebo
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niezwykłe chmury

Added over a year ago by wieslawa

118 1

kangury skaczące - Eurowizja była i się skończyła
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kangury skaczące

Added over a year ago by lolitka

66

H2O wystarczy kropla - H2O wystarczy kropla
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H2O wystarczy kropla

Added over a year ago by Julia

36

Niezgodna - Książki napisane przez Veronicę Roth. Na ich podstawie powstał film.
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Niezgodna

Added over a year ago by veronica roth

6