If ideal things like ideal gas or ideal machine dont exist, then why do we define such things and compare usual things to ideal ones?

Brijesh Kumar You are right. They should be called “simple” things. In reality, they are simplifications of real world systems. So, we should call: “simple gas” and “simple machine”. We use those to make our analysis easier. They are good approximations or starting points of real world systems. So, to call them an “ideal gas” … Read moreIf ideal things like ideal gas or ideal machine dont exist, then why do we define such things and compare usual things to ideal ones?

If ideal things like ideal gas or ideal machine dont exist, then why do we define such things and compare usual things to ideal ones?

Brijesh Kumar You are right. They should be called “simple” things. In reality, they are simplifications of real world systems. So, we should call: “simple gas” and “simple machine”. We use those to make our analysis easier. They are good approximations or starting points of real world systems. So, to call them an “ideal gas” … Read moreIf ideal things like ideal gas or ideal machine dont exist, then why do we define such things and compare usual things to ideal ones?

Does the conductance of a semiconducter change when the Fermi level [math]E_F[/math] stays the same, but the distance to the valence band increases?

Brijesh Kumar Conductance depends on the size of the material, so let us talk about conductivity which is independent of physical size. conductivity = [math]ne\mu_n+pe\mu_p[/math] Now, to solve this question, let us make some assumption: The density of states is the same in both materials (Nc, Nv) The mobility for both electrons and holes is … Read moreDoes the conductance of a semiconducter change when the Fermi level [math]E_F[/math] stays the same, but the distance to the valence band increases?

Does the conductance of a semiconducter change when the Fermi level [math]E_F[/math] stays the same, but the distance to the valence band increases?

Brijesh Kumar Conductance depends on the size of the material, so let us talk about conductivity which is independent of physical size. conductivity = [math]ne\mu_n+pe\mu_p[/math] Now, to solve this question, let us make some assumption: The density of states is the same in both materials (Nc, Nv) The mobility for both electrons and holes is … Read moreDoes the conductance of a semiconducter change when the Fermi level [math]E_F[/math] stays the same, but the distance to the valence band increases?

Are people in the US less judgmental than Indians?

Brijesh Kumar No. They just don’t express their judgments, because they know that others will judge them too and express their opinions. It is an unspoken rule: I don’t speak about bad things that you do and you don’t speak about bad things I do. Moreover, the standards expected from humans are consistently going down. … Read moreAre people in the US less judgmental than Indians?

Are people in the US less judgmental than Indians?

Brijesh Kumar No. They just don’t express their judgments, because they know that others will judge them too and express their opinions. It is an unspoken rule: I don’t speak about bad things that you do and you don’t speak about bad things I do. Moreover, the standards expected from humans are consistently going down. … Read moreAre people in the US less judgmental than Indians?