What is enthalpy?/ what is latent heat of fusion? what is latent heat of vapourisation? / Which is more dangerous for you: 100โ water or 100โ steam?What is enthalpy?
Enthalpy is the total amount of heat energy in a thermodynamic system.
We are understanding this cycle with the help of the temperature enthalpy graph. To understand this concept let 1 kg of ice at -23โ convert into 200โ superheated steam.
From -23โ to 0โ ice gets heated and slowly increases its temperature and it comes in 0โ ice first. then it converts its state from ice to water.
From -23โ to 0โ of 1 kg ice heating process takes near about 48 KJ of heat energy.
Then this again gets heated and 0โ ice state changes into 0โ water. Here 333 KJ of heat energy is required to convert into 0โ water. This is called the latent heat of fusion. On further heating, the 0โ water and raising its temperature to 100โ requires 430 KJ of heat energy.
To convert 100โ 1 kg of water to 100ยฐC steam takes around 2267 KJ of heat. This is called the latent heat of vaporisation.
At 100โ when all have been converted into steam, now superheating starts from 100โ to 200โ steam and takes approximately 300 KJ of heat energy.Heating from 0โ water to 100โ water takes 30 minutes time and 430 KJ of heat energy. and 100โ water to 100โ steam takes 5 times the heat energy and time. From 100โ steam to 200โ superheat steam takes 300 KJ of heat energy and takes less time.
Which is more dangerous for you: 100โ water or 100โ steam?
100โ steam is more dangerous for you because there is more heat energy (Enthalpy) present at this temperature. 100โ steam has 2267 KJ of heat energy more than 100โ water. For this reason, 100โ steam is more dangerous than 100โ water.
Note:
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