What Causes the Real Increase in Liquid Volume in Thermodynamics?

[mohamedsafy]

hi
iam a new user here iam a student in engineering faculty there is something i don't understand in thermo dynamics physics in my book it is written that the real increase in volume of liquid= the apparent increase in volume of liquid+ the increase in volume of the container
my opinion is that the real increase in volume of liquid = the apparent increase - the increase in the volume of the container the problem is driving me crazy ca anyone help me and explain to me
and there is another point i need to know the definistion of the universal gas constant R anyone interesed to help me
thx alot

 

[Doc Al]

To understand the book's statement, study this exaggerated case: Say the container volume doubles, but the apparent volume of the liquid does not change. What must be the real increase of the liquid volume?

If that doesn't click, look at it backwards. Say that both the liquid and the container volumes doubled. What would the apparent volume increase of the liquid be?

 

[charng]

Hello there,

I am sorry to hear that you are facing difficulties with understanding thermodynamics in your engineering studies. I can certainly help clarify the concept for you.

The statement in your book is correct - the real increase in volume of a liquid is equal to the apparent increase in volume of the liquid plus the increase in volume of the container. This is because when a liquid is heated, it expands and takes up more space, but the container also expands slightly due to the heat. So, the total increase in volume is a combination of the liquid's expansion and the container's expansion.

As for the definition of the universal gas constant, R, it is a proportionality constant that relates the amount of substance, pressure, and temperature of an ideal gas. It is a fundamental constant in thermodynamics and is used in many equations, such as the ideal gas law. Its value depends on the units used, but it is commonly expressed in units of joules per mole-kelvin (J/mol-K).

I hope this helps clarify the concepts for you. If you have any further questions, please don't hesitate to reach out. I wish you all the best in your studies.