Investigating the Energy Content of Different Foods
Aim: To investigate the energy content of different foods.
Introduction: We can show that food is a fuel by burning it, using
this, we are going to investigate the energy content of four different
foods; peanut, bread, pasta and a Brazil nut. Food is also a fuel in
another sense. Plants and animals use food to get their energy.
Different foods contain different types and amounts of energy. When
food, and all other fuels (e.g. coal, oil, etc.), is burned, energy in
the form of heat is transferred to it's surroundings warming them.
The body's most basic need is for energy. To get energy it needs food
as a fuel and oxygen to burn it. The amount of energy foods can
produce is measured in units called calories. A food calorie, or
kilocalorie, is the amount of heat required to raise the temperature
of 1 kilogram (2.2 pounds) of water 1 degree Celsius (1.8 degrees
Fahrenheit). The body changes the calories in food into energy, which
is necessary for every act from blinking an eye to running a race.
Energy is also used for the growing process, for rebuilding damaged
cells, and for regulating body systems.
The number of calories needed each day depends upon how much energy an
individual's body uses. An active child can need more calories than an
adult who works at a desk. The body needs more calories in cold
weather to stay at an even temperature.
Prediction/Hypothesis: I think that the Brazil nut will contain the
most energy. I did some energy amounts each food has, the results are
as below;
Brazil Nut: 265000 joules per gram
Peanut: 24600 joules per gram
Bread: 24600 joules per gram
Pasta: 2500 joules per gram
Although both types of nut contain high levels of energy, they might
contain less of other substances, like protein, for example. Which
Bread and Pasta can provide more of.
Diagram:
Method:
1) Set up apparatus as shown in diagram
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