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 …
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 …
Chemistry, thermodynamics: temperature increase caused by compression, continued Read more »
The tutor begins about thermodynamics with the example of compressing a gas. Thermodynamics is the analysis of energy – particularly, how it moves and/or changes form. The First Law of Thermodynamics is the Law of Conservation of Energy: Energy cannot …
Thermodynamics: first law, with compression of a gas Read more »
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 …
The tutor shares the term adsorption, which he recently discovered. Apparently, adsorption is the event when free-moving molecules become attached to a solid surface. It perhaps can be witnessed when water fogs a windshield. Another example is the use of …
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 …
Physical chemistry: efficiency of internal combustion engine in hot vs cold weather Read more »
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 …
The tutor shows a nice trick to obtain a least squares line using matrix algebra. In my Nov 25 post I mentioned how, with Excel or LibreOffice Calc, to get a best-fit line for x y 0 3 2 5 …
Linear algebra: best fit line: method of least squares by hand Read more »
The tutor shows how to get a graph and equation for data using LibreOffice Calc, in six easy steps. Let’s imagine your x-data is in a1:a5, your y-data, b1:b5. Select the range a1:b5. Click the Chart icon, which looks like …
Spreadsheets: LibreOffice Calc: how to get a graph and equation from data Read more »
The tutor shares quick, easy way to get a graph and equation from Excel, 2007 version. Let’s imagine your x data is in range a1:a10, your y-data, b1:b10. Select a1:b10, then click Insert, then the Scatter icon. Then, in the …
Excel: How to make a graph from data and get an equation, 4 easy steps Read more »