Tuesday, July 16th, 2013
5:47 pm - Sweltering...  
I find myself using the word "sweltering' quite a lot lately. Indoor/outdoor thermometer is reading 86° in the house right now*, and 100° outside. I don't think it's really quite that high. The outdoor sensor is under the eave in front of the house, which faces west, not the best place for accuracy. Weather.com is telling me it's 86° out there, but that's not right, either. Somewhere in between, I think. I was going to mow the lawn when I got home, but heat stroke is a concern. I took a ride last evening, and it was like riding through soup. The piney woods smelled nice**, while the Great Swamp was more fetid.

* I only got home from school/lunch with Tom and his family an hour ago, and the A/C hasn't yet caught up yet.

** Speaking of smelling nice, driving by Schartner's strawberry fields towards the end of June was just amazing.


I think the heat and humidity actually affected the experiment the class did today. They were measuring the heat of fusion of ice, the amount of energy it takes to covert water from a solid to a liquid. You do this by throwing some ice cubes in a styrofoam cup with warm water in it, and calculating how much heat the original water loses. The two values are equal and opposite, so you then know the total energy it took to melt the ice. Except... even though the building has A/C, it was really humid in the lab. Warm, humid air carries a lot of heat, so there was more than one source of heat to melt the ice. The average percent error I saw was about 50%. Not good results. The procedure isn't especially accurate to begin with***, and the conditions made it worse. Tom and I discussed the procedure later, so maybe some changes will be made.

***I told one student that the procedure was a "quick and dirty method," although not especially dirty considering the final outcome is cold water.

I need to start gathering my camping equipment for the trip to Maine on Thursday. I'm off tomorrow, so I have the whole day to pack the truck. Key things to do include figuring out how I mounted the bike rack on the back of the truck back in 2002 when I took it to Canada. Normally the bike stays under the tonneau cap, but with all the camping stuff there isn't much room. The rack was designed to attach to a trunk or hatchback, as on my old Subaru, not so much a tail gate. I did switch the narrow tires on the bike to a pair slightly more suitable for riding Acadia's gravel carriage trails.

Don't find out till tomorrow night if I have to teach Thursday.

Still sweltering...
 
 
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arlissarliss on July 16th, 2013 - 10:45 pm
It's 86 today, full sun, and no AC. But we usually only have four-to-ten days a year at that high, so we either drive around in the AC'd car in the heat of the day, or find a movie. I'll remember these weeks of unremitting sun fondly in November and February.

Have a great time in Maine!
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DXMachina: Calvindxmachina on July 17th, 2013 - 12:11 am
The A/C in my truck died a couple of years back (two months after I'd had it repaired), so I don't have that option. Usually the drive is fine since the windows still work, but today even doing 75 on the highway was hot.

Still, I never noticed how good the strawberry fields smelled back in the days I drove by when the A/C worked, so I guess that's something.
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