- #1
ElectricRay
- 73
- 18
Hi all,
A happy 2018 for all PF members.
I have a question. I am trying to understand some basic principle of thermodynamics. My book tells me tge following:
"Heating of a gas at a constant pressure uses more heat as when heating the same gas a constant volume"
How do i interpret this? I find this paradoxical. If I visualize this for myself I come at the following:
I have a gas this gas is e.g. in a box which I will heat up to e certain temperature. Let say it gets 10 deg C higher. If the pressure is maintained constant (which i don't understand first of all, i thought that the pressure would increase as I heat the gas) I need more energie (joules) as when I heat up the gas to the same 10 deg C high but with a constant volume.
This all confuses me a lot. Can anybody help me understand this phenomena?
Thanks in advance
Raymond
A happy 2018 for all PF members.
I have a question. I am trying to understand some basic principle of thermodynamics. My book tells me tge following:
"Heating of a gas at a constant pressure uses more heat as when heating the same gas a constant volume"
How do i interpret this? I find this paradoxical. If I visualize this for myself I come at the following:
I have a gas this gas is e.g. in a box which I will heat up to e certain temperature. Let say it gets 10 deg C higher. If the pressure is maintained constant (which i don't understand first of all, i thought that the pressure would increase as I heat the gas) I need more energie (joules) as when I heat up the gas to the same 10 deg C high but with a constant volume.
This all confuses me a lot. Can anybody help me understand this phenomena?
Thanks in advance
Raymond