- #1
Dx
Equal masses of water 20C and 80C are mixed. what is the inal temp of the mixture?
I said 60C
why is this incorrect?
Dx
I said 60C
why is this incorrect?
Dx
Originally posted by Dx
Thanks Tom!
dx
is not correct. You don't know what the "final" temperature will be because you don't know the temperature of the environment. In order to do this problem, you will have to interpret "initial" temperature as the temperature immediately AFTER mixing.It's not correct because 60 degrees is the final (not initial) temperature.
Originally posted by HallsofIvy
Once again, DX, be careful of Tom's answers.
The problem with asking someone to give you the answer is that they may just give you a WRONG answer!
is not correct. You don't know what the "final" temperature will be because you don't know the temperature of the environment. In order to do this problem, you will have to interpret "initial" temperature as the temperature immediately AFTER mixing.
What makes you think the temperature will be 60 degrees? The only way I see that you can get 60 is to subtract 20 from 80. Do you have any reason for that? If the two temperatures had been 60 and 50 would you say that the mixture will be 10 degrees? Does that even make sense?
It should make sense to you that if you mix two things the final temperature will be BETWEEN the two original ones. In fact you should think about finding the average of the two temperatures.
What is the average of 20 and 80 degrees?
You should also think about how you would "average" the temperatures there were more water at one temperature than the other.
Suppose you had 10 grams of water at 20 degrees and 40 grams of water at 80 degrees. ABOUT what do you think the temperature of the mixture would be? How would you calculate it exactly?
Originally posted by HallsofIvy
You should also think about how you would "average" the temperatures there were more water at one temperature than the other.
Heat is a form of energy that is transferred from one object to another due to a temperature difference. In the case of equal masses of H20, heat is the energy that causes the temperature of the water to increase or decrease.
The specific heat of a substance is the amount of energy required to raise the temperature of 1 gram of the substance by 1 degree Celsius. H20 has a high specific heat, which means it requires a lot of energy to raise its temperature. This means that equal masses of H20 will take longer to heat up compared to other substances with lower specific heats.
The relationship between mass and temperature in terms of heat is directly proportional. This means that as the mass of H20 increases, more energy is needed to raise its temperature compared to a smaller mass of H20. Similarly, as the temperature of H20 increases, more energy is needed to raise its mass compared to a lower temperature of H20.
The heat capacity of a substance is the amount of heat energy required to raise the temperature of the substance by 1 degree Celsius. H20 has a high heat capacity, meaning it can hold a large amount of heat energy without experiencing a significant change in temperature. This makes it an effective heat retainer, as it can maintain its temperature for a longer period of time compared to substances with lower heat capacities.
Understanding the relationship between heat and equal masses of H20 has numerous practical applications. This knowledge is important in industries such as cooking and brewing, where precise temperature control is necessary for optimal results. It is also used in heating and cooling systems, as well as in the study of weather patterns and climate change.