. Adventures with animals and plants. Biology. PROBLEM I. Hoiv to Choose Foods Wisely 169. Fig. 190 What was the original source of the egg eaten by the skunk, and the ?nilk lapped up by the cat? What is the source of all the food eaten by animals? (johnson, Schneider and SCHWARTZ, GEHR) To measure anything there must be a unit of measurement. Scientists have agreed on a i^mit for heat energy. They call it a 4^alo£ie[^ (k;al'-(>r5€TnT"'ir'the amomit^ of J^p-^r rpqjiired to raise the temperature__jif_mTe kilogramTa"'little FeUian one quart) of water one de- gree centigiadj&>
. Adventures with animals and plants. Biology. PROBLEM I. Hoiv to Choose Foods Wisely 169. Fig. 190 What was the original source of the egg eaten by the skunk, and the ?nilk lapped up by the cat? What is the source of all the food eaten by animals? (johnson, Schneider and SCHWARTZ, GEHR) To measure anything there must be a unit of measurement. Scientists have agreed on a i^mit for heat energy. They call it a 4^alo£ie[^ (k;al'-(>r5€TnT"'ir'the amomit^ of J^p-^r rpqjiired to raise the temperature__jif_mTe kilogramTa"'little FeUian one quart) of water one de- gree centigiadj&>--Thus jtJa£x:i^TTes_^ to measure the am^mnt-of heat by meas- urin^g^'^with a thermometer the rise in temT tei ire of pure water. When the risen 7° C, we say 7 Calories of heat en- ergyliad beenaddgd^-If you can do Ex- ercise 2, you understand something about the measurement of heat. Measuring the energy in food. To find out how much heat is produced when a food compound is oxidized, some of the pure substance is weighed so that the experimenter knows exactly how much is going to be burned. The substance is then placed inside a chamber in which it can be oxidized. This chamber is sur- rounded by a jacket containing pure water which catches every bit of heat produced. The outside of the jacket is covered with asbestos or some other ma- terial that prevents escape of heat. The temperature of the water is taken before and after the oxidation. The amount of water in the jacket is known. And, since the experimenter knows how much the temperature of this water rises, it is easy to determine how many Calories were produced by the burning (oxidation) of that amount of food. In this way scien- tists have determined the amount of heat energy to be obtained from a known amount of protein, carbohydrate, and fat. The apparatus used is called a calo- rimeter (cal'o-rim'e-ter). Besides burning known amounts of pure proteins, carbohydrates, and fats, scientists have also tested most of th
Size: 1079px × 2315px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherbostondcheath, booksubjectbiology
