Evaporation Lab Report

Parts
Observations
1 Evaporation
Both the water and alcohol felt cool on the wrist. The water felt cooler at first, then the alcohol started evaporating faster and it felt cooler. The alcohol drew heat from the body as it’s evaporating thus creating a greater heat loss and temperature change.
3 Skin Prints
Different areas of the skin have different skin prints. A fingerprint has a loop design, whereas the skin print of a palm is straight and linear. The lines of a wrist print are interconnected and narrow. The skin print of an elbow is unorganized, in which the lines go in many different directions forming irregular shapes.
4 Touch Points
On the knee, the distance between the toothpicks was 3 cm when it felt like only one point. It was
Liquid requires heat to change into a vapor or gas, thus it draws heat from the body in order to evaporate. If the rate of evaporation is occurring faster, it indicates it is drawing more heat from the body in order to change its state of matter. Greater heat loss means a greater change in temperature. Thus, when the alcohol evaporates, the temperature of the skin is dropping and creates a cooling sensation. This shows our body’s sensitivity to temperature loss, and the ability to quickly detect it and act accordingly in response, to prevent further heat
The lab required pressing two toothpicks against the skin simultaneously. It was difficult to press down both toothpicks at the same time and this skewed the results. When the toothpicks weren’t pressed down at the same time, it felt like one point, then another point. Therefore, the person felt two distinctive pokes, and maybe if the toothpicks were pressed down at the exact same time, the person might’ve felt one point instead.

The error in part five is due to the character of the tape. The tape that was used to adhere to the skin cells was opaque. This created a problem, when magnifying the skin cells under the microscope, it could not focus. This was because the tape was not clear and thus blurred the magnification and the clarity of the slide. The outcome was not ideal and we were unable to view the cells under greater magnification. The different types of sweat glands are eccrine and apocrine. Eccrine glands are the most abundant. They leave the body through simple coiled tubes that begins in the dermis layer. The sweat travels from the tubes to the extended ducts, and exits the skin from the pores. Apocrine glands empty sweat into hair follicles. It is most active during puberty. These glands are found in the armpit and groin. Apocrine glands secrete sweat that contains fats and