Difference between revisions of "Calorimetry Lab"
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All living organisms have many chemical reactions going on 24/7. Most of these reactions are '''''exothermic''''', meaning that these reactions give off heat. So you should not be surprised to ''see'' that a person, like the man on the left is radiating heat. As you know, [https://en.wikipedia.org/wiki/Human_body_temperature humans are warm blooded organisms] that maintain their body temperature at 37 <sup>o</sup>C or 98.6 <sup>o</sup>F. The above images use infrared (IR) imaging to detect the heat (IR light) emitting from all warm blooded organisms. We will talk more about IR light in our next chapter. | All living organisms have many chemical reactions going on 24/7. Most of these reactions are '''''exothermic''''', meaning that these reactions give off heat. So you should not be surprised to ''see'' that a person, like the man on the left is radiating heat. As you know, [https://en.wikipedia.org/wiki/Human_body_temperature humans are warm blooded organisms] that maintain their body temperature at 37 <sup>o</sup>C or 98.6 <sup>o</sup>F. The above images use infrared (IR) imaging to detect the heat (IR light) emitting from all warm blooded organisms. We will talk more about IR light in our next chapter. | ||
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| + | The man on the left has a skin temperature of ~93 <sup>o</sup>F. The inside corners of his eyes and his lips are slightly higher in temperature at ~95 <sup>o</sup>F. Because the outside temperature is usually less than body temperature, the surface of the skin is slightly cooler than the internal core temperature of 98.6 <sup>o</sup>F. This is why when we measure the temperature of an individual, it is best to put a thermometer under your tough or in up the ... (you know). There is devices that are calibrated to measure internal temperature by measuring outside skin temperature, but these are not as reliable as doing an "under tongue" measurement. | ||
The woman above and in the middle has an IR image that i slightly different from the man. | The woman above and in the middle has an IR image that i slightly different from the man. | ||
:'''''Q: What differences do you see? (write these down in your notes...then move on).''''' | :'''''Q: What differences do you see? (write these down in your notes...then move on).''''' | ||
Revision as of 16:15, 6 April 2020
Welcome to the Calorimetry Gen Chem Lab...sort of...
As was discussed in lecture this morning, the current chapter is titled thermochemistry...the heat associated with a chemical reaction. You now have a clear understanding of a chemical reactions...there are reactants, products, balancing coefficients, and now there is heat. Let's start our conversation with a simple observation.
Thermal Imaging
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All living organisms have many chemical reactions going on 24/7. Most of these reactions are exothermic, meaning that these reactions give off heat. So you should not be surprised to see that a person, like the man on the left is radiating heat. As you know, humans are warm blooded organisms that maintain their body temperature at 37 oC or 98.6 oF. The above images use infrared (IR) imaging to detect the heat (IR light) emitting from all warm blooded organisms. We will talk more about IR light in our next chapter.
The man on the left has a skin temperature of ~93 oF. The inside corners of his eyes and his lips are slightly higher in temperature at ~95 oF. Because the outside temperature is usually less than body temperature, the surface of the skin is slightly cooler than the internal core temperature of 98.6 oF. This is why when we measure the temperature of an individual, it is best to put a thermometer under your tough or in up the ... (you know). There is devices that are calibrated to measure internal temperature by measuring outside skin temperature, but these are not as reliable as doing an "under tongue" measurement.
The woman above and in the middle has an IR image that i slightly different from the man.
- Q: What differences do you see? (write these down in your notes...then move on).