# Recent Content by Mapes

1. Post

### I What is the formula 1/(dS/dE)>>0 and how does it apply?

$1/(\partial S/\partial E)$ with entropy $S$ and energy $E$ is the definition of temperature (I've replaced the absolute derivative $d/dx$...
Post by: Mapes, Dec 9, 2017 in forum: General Physics
2. Post

### B Why is it so much easier to increase the temperature of something vs. decreasing it?

Regarding the perceived asymmetry between heating things up vs. cooling them down, note that we're surrounded by sources of low-entropy,...
Post by: Mapes, May 16, 2017 in forum: General Physics
3. Post

### Relation between Young's modulus and the coefficient of thermal expansion

Please see the discussion of the correlation between stiffness, melting temperature, and thermal expansion here. You can investigate the...
Post by: Mapes, Apr 18, 2017 in forum: Materials and Chemical Engineering
4. Post

### I Is a quasi-static but irreversible process possible?

Whenever energy transfer is driven by a gradient (e.g., a pressure difference causing a change in volume, a voltage difference causing electric...
Post by: Mapes, Apr 5, 2017 in forum: Classical Physics
5. Post

### I Is a quasi-static but irreversible process possible?

A reversible process doesn't increase entropy and thus cannot exist in the real world (although we can come arbitrarily close). Every real process...
Post by: Mapes, Apr 2, 2017 in forum: Classical Physics