02 SEP 2016 by ideonexus

Teaching Temperature

Outside Temperatures. Place a thermometer outside a window so students can make daily calculations and keep a chart reporting the actual temperature and the temperature change from the previous day. Students will see that the change can be a negative number without the temperature falling below 0—an often-confusing concept that is clarified by these observations. An achievable-challenge extension could include barometers, and students who need more advanced work can learn how negative—or...
1  notes

18 NOV 2013 by ideonexus

An Example of the Joy of Hard Science Fiction

If they are going to sink below, then the pressure on the vessel is going to rise as Verne talked about in 20,000 Leagues Under the Sea. If the pressure on the vessel is going to rise, then it's going to collapse unless the pressure within the vessel rises. So the captain is slowly letting the vessel sink into the Moon dust, while the crew is not letting onto the tourists that anything is wrong, but the pressure is slowly going up. Now just as we don't typically notice the pressure go up or ...
1  notes

This example from a Clarke novel illustrates the fun of Hard-SF in how it leaves it up to the reader to figure things out from their scientific literacy.

07 OCT 2013 by ideonexus

Understanding Heat and Temperature

Our sense of touch tells us quite definitely that one body is hot and another cold. But this is a purely quali- tative criterion, not sufficient for a quantitative descrip- tion and sometimes even ambiguous. This is shown by a well-known experiment: we have three vessels con- taining, respectively, cold, warm and hot water. If we dip one hand into the cold water and the other into the hot, we receive a message from the first that it is cold and from the second that it is hot. If we th...

An excellent description of the distinction between the two.

30 NOV -0001 by ideonexus

Should Spelling be Modernized?

The time taken to teach the decimalised system for currency, temperature, weights and distances is far shorter and more certain than when 240 pence equalled a pound, 32 degrees Fahrenheit equalled the temperature of ice and pounds and ounces were taught. Already there is a generation that was spared these ancient measurements. To improve literacy in the general population, modernisation of the spelling system will bring similar benefits to what decimalisation brought.
Folksonomies: phonetics
Folksonomies: phonetics
1  notes
It takes just one generation to fix spelling and improve literacy for future generations. Just as it took one generation to move to the metric system or change currencies in Europe.