# Deatach

'S e stuth a tha na ghas aig teòthachd nas ìsle na a theòthachd riatanach a th' ann an **deatach**. Le sin, co-dhlùthaichidh an t-uisge a tha na ghas gu uisge lionnna/soladach ma thèid ìre a' bhrùthaidh a tha a' toirt buaidh airsan suas gun an teòthachd aige a dhol sìos aig an aon àm. Air an dàrna làimh, ma cho-dhlùthaicheas gas air choireigin aig teòthachd chunbhalach, thèid am brùthadh suas. Air an làimh eile feumar an teòthachd a lughdachadh airson stuth nach eile na dheatach gu stuth lionna. Mar eisimpleir, 's ann aig 374 °C a ruigeas an t-uisge a theòthachd riatanach agus chan fhaod uisge lionna a dhol nas àirde na sin. Faodaidh stuth a tha na dheatach a bhith ann còmhla ri stuth lionna/soladach aig an aon àm. Ma ghabh sin a thachair, bidh cothrom ann agus bidh brùthadh a' ghas co-ionnan ri na tha a' toirt buaidh air an stuth lionna/soladach.

Canar deatach ri stàit a' ghas (stàit far nach bi na moileciuilean a' frith-ghluasad ri ceanglaichean a dhèanamh eatorra fhèin, seach gan ais-bualadh, agus a' toirt cruth agus volum del recipient far a bheil iad, gan tuiteam a-mach à chèile, is iad a' sìor-leudachadh) aig an teòthachd riatanach. Chitheamaid san dealbh, 's e an ìre ghasach a chnar ris an deatach a tha dùinte leis an loidhne bheartagail a sheallas an teòthachd riatanach agus na lùban gorma (an lùb deatachaidh) lei san lùb uile-dheatachaidh annn an dearg, a sheallas ciamar a dh'atharraicheas stuth lionna/soldach gu bhith na dheatach. 'S e an gas a tha air a theasachadh cus agus e nas teotha na an teòthachd riatanach aige ach fon bhrùthach riatanach aige.

Na rachamaid ann am breisleach: 's ann eadar-dhealaichte 's a tha deatach agus gas. Mar as àbhaist, cha chanar deatach ach ri deatach an uisge, leis gur e sin an gas a chruthaichear ma ghoilear an t-uisge gu 100 ° C ann an àile fo bhrùthadh àbhaisteach, air neo nuair a dh' atharraichear stàie an uisge, is an t-uisge aig teòthachd sam bi a tha fon teòthachd riatanach, agus am brùthadh fo ìre brùthadh an uisge aig an teòthachd sin. 'S e dèabhadh a chanar ri sin.

## Figearan a' Bhrùthaidh

*Figearan airson a' bhrùthaidh air deatach an uisge, a rèir bàraichean na teòthachd.*| °C | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 0 | 0,006351 | 0,006827 | 0,007335 | 0,007876 | 0,008452 | 0,009066 | 0,00972 | 0,010411 | 0,011147 | 0,011929 |
| 10 | 0,01276 | 0,01364 | 0,014574 | 0,015563 | 0,01661 | 0,017719 | 0,018893 | 0,020135 | 0,021444 | 0,022831 |
| 20 | 0,024299 | 0,025849 | 0,027481 | 0,029194 | 0,031009 | 0,032926 | 0,034935 | 0,037056 | 0,039289 | 0,041634 |
| 30 | 0,044102 | 0,046702 | 0,049425 | 0,052290 | 0,055298 | 0,058459 | 0,061763 | 0,065240 | 0,068881 | 0,072694 |
| 40 | 0,076681 | 0,080872 | 0,085247 | 0,089825 | 0,094618 | 0,099635 | 0,104866 | 0,110342 | 0,116062 | 0,122027 |
| 50 | 0,128258 | 0,134764 | 0,141534 | 0,148611 | 0,155984 | 0,163662 | 0,171666 | 0,180008 | 0,188685 | 0,19772 |
| 60 | 0,207101 | 0,21689 | 0,227087 | 0,23759 | 0,248603 | 0,260024 | 0,271852 | 0,28419 | 0,296937 | 0,310295 |
| 70 | 0,324061 | 0,338336 | 0,353122 | 0,368418 | 0,384325 | 0,400844 | 0,417873 | 0,435616 | 0,453868 | 0,472835 |
| 80 | 0,492413 | 0,512705 | 0,533711 | 0,555431 | 0,577864 | 0,601011 | 0,624974 | 0,649753 | 0,675347 | 0,701758 |
| 90 | 0,728882 | 0,757025 | 0,786189 | 0,816168 | 0,847065 | 0,878879 | 0,911816 | 0,94567 | 0,980544 | 1,016743 |
| 100 | 1,053554 | 1,091793 | 1,131051 | 1,171533 | 1,213239 | 1,256066 | 1,300219 | 1,345596 | 1,392298 | 1,440326 |
| 110 | 1,489680 | 1,540359 | 1,592567 | 1,646204 | 1,701267 | 1,757861 | 1,815984 | 1,875636 | 1,936920 | 1,999836 |
| 120 | 2,064383 | 2,130663 | 2,198575 | 2,268323 | 2,339906 | 2,413222 | 2,488476 | 2,565565 | 2,644592 | 2,725658 |
| 130 | 2,808662 | 2,893705 | 2,980889 | 3,070317 | 3,162090 | 3,254882 | 3,350734 | 3,448625 | 3,549576 | 3,652565 |
| 140 | 3,757595 | 3,870781 | 3,974791 | 4,087977 | 4,202184 | 4,320469 | 4,440794 | 4,564177 | 4,6896 | 4,818083 |
| 150 | 4,949624 | 5,083205 | 5,219844 | 5,360563 | 5,503321 | 5,649138 | 5,798014 | 5,950969 | 6,105964 | 6,265037 |
| 160 | 6,426149 | 6,591341 | 6,760611 | 6,931921 | 7,107309 | 7,286776 | 7,469303 | 7,654888 | 7,844552 | 8,038295 |
| 170 | 8,235097 | 8,436998 | 8,641958 | 8,849976 | 9,063094 | 9,280290 | 9,500545 | 9,725899 | 9,955331 | 10,188842 |
| 180 | 10,426433 | 10,668101 | 10,913849 | 11,165715 | 11,421660 | 11,681683 | 11,945786 | 12,214986 | 12,489286 | 12,768683 |
| 190 | 13,052160 | 13,340735 | 13,634409 | 13,933181 | 14,237051 | 14,546021 | 14,860088 | 15,179254 | 15,503519 | 15,833902 |
| 200 | 16,169383 | 16,510982 | 16,857680 | 17,209477 | 17,567392 | 17,931425 | 18,301576 | 18,676825 | 19,058193 | 19,445679 |
| 210 | 19,839283 | 20,239006 | 20,644846 | 21,057825 | 21,475902 | 21,900097 | 22,33245 | 22,974861 | 23,21551 | 23,666217 |
| 220 | 24,125082 | 24,590066 | 25,061167 | 25,540426 | 26,025803 | 26,519338 | 27,018991 | 27,526802 | 28,04073 | 28,562817 |
| 230 | 29,093061 | 29,629423 | 30,173943 | 30,726620 | 31,286435 | 31,854408 | 32,429519 | 33,013807 | 33,502244 | 34,204817 |
| 240 | 34,812558 | 35,429477 | 36,053533 | 36,686767 | 37,328158 | 37,977707 | 38,636433 | 39,304337 | 39,980398 | 40,665636 |
| 250 | 41,359032 | 42,062625 | 42,776415 | 43,500402 | 44,224389 | 44,968770 | 45,713151 | 46,477926 | 47,242701 | 48,017673 |
| 260 | 48,813039 | 49,608405 | 50,413968 | 51,229728 | 52,055685 | 52,891839 | 53,748387 | 54,604935 | 55,471680 | 56,348622 |
| 270 | 57,245958 | 58,143294 | 59,050827 | 59,978754 | 60,906681 | 61,855002 | 62,81352 | 63,782235 | 64,761147 | 65,750256 |
| 280 | 66,749562 | 67,759065 | 68,788962 | 69,818859 | 70,869150 | 71,929638 | 73,000323 | 74,081205 | 75,182481 | 76,293954 |
| 290 | 77,415624 | 78,547491 | 79,689555 | 80,852013 | 82,024668 | 83,207520 | 84,410766 | 85,624209 | 86,847849 | 88,081686 |
| 300 | 89,335917 | 90,600345 | 91,885167 | 93,180186 | 94,485402 | 95,800815 | 97,136622 | 98,492823 | 99,849024 | 101,235816 |
| 310 | 102,622608 | 104,029794 | 105,457374 | 106,895151 | 108,343125 | 109,811493 | 111,300255 | 112,799214 | 114,318567 | 115,848117 |
| 320 | 117,387864 | 118,958202 | 120,538737 | 122,129469 | 123,740595 | 125,372115 | 127,013832 | 128,675943 | 130,358448 | 132,05115 |
| 330 | 133,764246 | 135,497736 | 137,241423 | 139,015701 | 140,800176 | 133,427745 | 144,420111 | 146,265768 | 148,121622 | 149,99787 |
| 340 | 151,894512 | 153,811548 | 155,738781 | 157,696605 | 159,674823 | 161,663238 | 163,682244 | 165,721644 | 167,771241 | 169,851429 |
| 350 | 171,952011 | 174,072987 | 176,214357 | 178,376121 | 180,558279 | 182,771028 | 185,004171 | 187,257708 | 189,317502 | 191,836161 |
| 360 | 194,171274 | 196,516584 | 198,902682 | 201,298977 | 203,73606 | 206,193537 | 208,671408 | 211,190067 | 213,72912 | 216,298764 |
| 370 | 218,909196 | 221,540022 | 224,211636 | 226,913841 | 229,656834 | - | - | - | - | - |

## Ceanglaichean A-muigh

* TVO
* Höyry
* Ilmatieteen Laitos

## Iomraidhean