Tutoring chemistry, heat flow between hot and cold substances might be studied. The tutor mentions a reflection about water and ice. Today, while thawing chicken breasts in water, I wondered how much water would be needed to supply the necessary…
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Category: physical chemistry
Physical chemistry: vapor pressure: why a car may be harder to start in the winter
The tutor implicates the Clausius-Clapeyron equation to explain why combustion is more difficult at lower temperatures. To burn, a fuel must evaporate.1 In colder temperatures, fuel has less tendency to evaporate. For two specific temperatures (T1 and T2), the Clausius-Clapeyron…
Tagged with: vapor pressure of gasoline
Chemistry: Amonton’s Law
The tutor introduces an interesting law from chemistry. Amonton’s Law states that the pressure of a gas is directly related to its absolute temperature: P=kT, where k is some constant. Amonton’s Law needs the conditions of constant moles of gas…
Chemistry, thermodynamics: temperature increase caused by compression, continued
The tutor looks more specifically into the effect of compression on gas temperature. In my January 20 post I began about thermodynamics and the effect of compressing a gas. Today, I’ll give more specific coverage. The temperature rise a gas…
Tagged with: isentropic gas expansion temperature change
Chemistry: diffuse vs effuse
The tutor offers definitions of diffuse and effuse, two related terms from chemistry. To diffuse is to spread out, while to effuse is to escape. A gas will diffuse through the atmosphere, while it will effuse through a hole in…
Physical chemistry: efficiency of internal combustion engine in hot vs cold weather
Jack
Posted in chemistry, energy, engineering, mechanics, physical chemistry, physics
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The tutor examines the idea that internal combustion engines are more efficient in cold weather. An upper limit for efficiency of an internal combustion engine is eff = (Tcombust – Tsurrounding)/Tcombust where Tcombust is the temp of the combustion cylinder…
Chemistry: what is a state function?
The tutor defines the term state function. A state function is one that is independent of path. Another way of explaining it: for a state function, if you end up where you started, nothing has changed. An example of a…
Tagged with: state function
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