Category Archives: General Science

Airliner vs Car Fuel Usage

As I looked at the cost of airline tickets versus driving, I became curious as to how much fuel was used to fly me out to a Montana airport such as in Bozeman or Butte. I was surprised to learn that airliners can be quite fuel efficient compared to cars. This post contains my analysis. Continue reading

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Dealing with Climate Change Denial

I have lunch with all sorts of people. Occasionally, I end up sitting with a climate change denier, which happened today. Usually, I do not say anything because I really do not want an argument.

Today, I decided to mention Figure 1, which summarizes a set of measurements made since 1900 that show that sea level is rising. I then asked the climate change denier if they can explain the fact that sea level is rising –a fact has been confirmed by multiple measurements taken at multiple sites over more than 100 years. Continue reading

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Volume Reduction in Ethanol-Water Mixtures

I recently toured a winery and, during the tour, I saw a number of charts related to various properties of ethanol and water mixtures. I was a bit puzzled when I saw Figure 1, which is a chart that I had never seen before. Figure 1 shows the amount of volume reduction experienced by an ethanol-water mixture compared to the separate volumes of the water and ethanol. I became curious about the chart and decided to see if I could derive these results on my own. Continue reading

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CO2 Tonnage Added To Atmosphere Per Year

My youngest son told me that I needed to watch the new Cosmos series with Neil deGrasse Tyson. I was immediately hooked – it is a masterpiece of scientific exposition for a general audience. I thought the original Cosmos with Carl Sagan was excellent, but the progress in computer graphics during the intervening decades makes the program visually stunning. Continue reading

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Converting Specific Humidity to Relative Humidity

I often have to interpret odd test requirements. In a test specification based on GR-487, a humidity test is called out where we need to have a fixed specific humidity (i.e. 24 grams of water vapor per per kilogram of air). For a given specific humidity, the relative humidity will vary with temperature. Since my test gear can control relative humidity, I need to derive a relationship between relative humidity and the specific humidity, which I show in Figure 1. Continue reading

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Nuclear Spent Fuel Annual Generation Rate

A coworker was telling me about a relative of his who is an engineer at a nuclear power plant. One of his relative's many jobs is to babysit nuclear waste casks (Figure 1) – a task which includes monitoring their temperature. These casks are warmed from the inside by the radioactive decay of the waste they hold. As I understand it, this job has good long-term security because these casks are going to be a safety hazard for tens of thousands of years. Continue reading

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Power Plant Conversion Efficiencies

While crawling around the Energy Information Administration (EIA) web page, I found some data on the energy conversion efficiencies of power plants based on the fuel that they use. I thought the data was interesting and worth going through here. Continue reading

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Lessons from RP Feynman

There is almost a cottage industry in RP Feynman quotes and stories. For an engineer, there is much gold to mined in his problem-solving methods. I read his book Surely You're Joking Mr. Feynman, and I have treated him as source of inspiration ever since. I was drawn to the joy he expressed about solving problems, and his skill in sharing that joy. Continue reading

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A Mathcad Utility Function for Air Pressure and Density

I have some work to do that requires a model for air density as a function of altitude, temperature, and pressure. As usual, I will turn to the Wikipedia to provide me a working model. I will then check the results of my model against results published by other sources. Continue reading

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Network Availability

I was in an interminable meeting the other day where we were discussing the MTBF and availability of a system. My issue with this discussion is that each person in the room preferred to think about these terms in different ways. In this post, I will show that the four individuals in the meeting were actually in violent agreement and simply did not understand that what their arguments were mathematically equivalent. I wish I could say that this was the first time in my career that this had happened, but that would not be true. It happens all the time. Continue reading

Posted in Electronics, General Science | 4 Comments