## Nathan Karsjens website

Nathan Karsjens website is https://mednathan.wordpress.com/

Nathan is a mathematics major in secondary teacher education at Western Illinois University (and a Leatherneck football player).

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## Atmospheric Pressure, inches of Mercury, and Pascals

I got a smart watch for Christmas. It has a ‘compass’ that also shows my longitude, latitude, altitude, and the Atmospheric Pressure in hPA.

So I studied up on the units for Atmospheric Pressure. Disclaimer: This is crude. I want to get some numbers I can remember.

Pa is an SI unit for atmospheric pressure. It means Pascal. One Pascal is 1 Newton per square meter. hPa is hectopascal. 1 hPa = 100 Pa

The ‘Imperial’ (English) unit would be PSI (pounds per square inch). BTW, 1 PSI is quite a bit, but 1 Pascal isn’t much.

Often the weather person on television give the atmospheric pressure in inches of Mercury (inHg).

### Conversions

1 inHg = 33.9 hPa
.02953 inHg = 1 hPa

### Low, Regular, and High Pressure

1000 hPa (29.5 inHg) is low pressure.
1010 hPa (29.8 inHg) is ‘regular’ pressure.
1040 hPa (30.7 inHg) is high pressure.

The key is which direction is the barometric pressure going (rising or decreasing).

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## Graphicacy

Good summary of what graphicacy is, especially early graphicacy in children. ￼

This definition of graphicacy￼ does not seem to be comprehensive enough to include spatial sense, but is an important subset, or component of, spatial sense and visualization￼. This definition of graphicacy seems to emphasize data visualization.

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## Two community colleges show how students can succeed without** remedial math courses

**Actually there is remediation, but it is just-in-time. There is corequisite support/remediation.

This sounds promising. Students do not like (or, equivalently, are not motivated) to take a semester-long remediation course.

Under this plan, the students may be taking a similar amount of math, but the (previous) pre-requisite is now a corequisite.

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## How to Graphically Interpret the Complex Roots of a Quadratic Equation

Very good stuff here. Nice mathematics, nice symmetry, nice visually!

Nice paper with an explanation of what is going on by Carmen Melliger here. Good mathematics!

Nice graphic by Shana McKay from Scaffolded Math. See also.

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## Websites for Spring 2019 – Math 304

Evan Wignall – https://etwignall98.weebly.com/

Will Kline – https://kline55.wordpress.com/

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## Make Your Daughter Practice Math. She’ll Thank You Later. (And by the way your son, too.)

Good opinion-editorial piece. I think it does deemphasize conceptual understanding problem-solving and may over-emphasize practice, but overall this is a good article.

I like the analogy of doing math in playing a musical instrument.

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## Catalyzing Change

Catalyzing Change in High School Mathematics: Initiating Critical Conversations

Book released by NCTM in April 2018.

See the page on this site.

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## Spring 2018 Websites

Here are the websites by students in Math 304 in the spring 2018 semester.

Mia Calderone: https://macalderone.wordpress.com/

Jerry Morales: https://soccer4life8295.wixsite.com/jerrym

Jordan Hughes: jhughes44.wordpress.com/

Logan Brown: https://mrbrownhomepage.wordpress.com/

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## Roots of Unity

on GeoGebra

https://www.geogebra.org/m/sZFwAZfs

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