How much water is in an orange??
What percentage of an orange is water?
All living things such as humans and plants must have water
to survive. Water gets recycled in a process called the water
cycle. Evaporation is the change of liquid-water to water vapor.
Evaporation of water occurs everyday whether it is in a cup or
outside in a lake. Evaporation is a major part of the water cycle.
A major section of food industry today is production of dry-foods.
It is a great way to preserve food when not in need. All sorts
of foods are dried including meats, vegetables, fruits and instant
coffee products. Drying food is the process of evaporating all
the interior water of a food product and in most cases this will
be done in a hot air tunnel. Many seasonal products will be dried
to reduce the cost of storage and distribution of the products
during the year. Drying Foods is less costly to store over a
long period of time. Some liquid foods such as orange juice are
usually partially dried to lose 80% of their water and the result
is called concentrate.
Since there is a lot of liquid juice in an orange, our hypothesis
states that there will be 50% or more water in an orange.
Material needed for this experiment:
1. An orange
2. Kitchen knife
3. Paper plate
4. Aluminum foil
5. Weighing Scale
- Weigh the orange
- Weigh the paper and aluminum foil which is being used to
dry the orange in.
- Cut the orange in very thin slices to speed up the drying
- Spread the slices over the paper, which is placed on the
- Keep it in a warm place until it is fully dry. You can expect
it to take 4-36 hours depending on the heat and airflow. We used
a desk light with a 150 watt lamp and a fan as a drier. We mounted
our desk light to be about a foot above the sliced oranges and
place the fan about 10 feet away from the orange slices facing
the oranges to create airflow. In this way we completed the drying
process in 10 hours.
- Weigh the orange slices once fully dried. Don't forget to
deduct the weight of the paper and the aluminum foil if you are
weighing the orange slices with the paper and aluminum foil.
Weight the orange, paper and aluminum
foil separately and together and record the results.
Use a precise scale for more accuracy.
Cut the orange in tin slices and
spread them over the paper and aluminum foil.
Keep the slices in a warm place
with enough air flow.
Weight the sample a few times to
trace the progress of drying.
Weight the final dry orange slices
to calculate the weight loss caused by drying.
Record And Analyze Data:
After the orange slices where completely dry, we put them
back on the weighing scale and weighed it with the paper and
aluminum foil. We then subtracted 15 grams from that total since
the foil and paper weighed 15 grams. Just like we stated before,
the orange weighed 309 grams before the experiment was started
and now weigh 58 grams. To figure out the percentage of solids
in the orange, we divide the weight of dry sample to the weight
of original sample that is : (58/309=0.1877). To figure out the
percentage of water in the orange, we used this formula: (309-58)/309=0.8122
In result of our experiment, we found out that orange is consisted
of 81% water.