7th grade science project ideas


Science Fair Project About Water in Orange Juice

When drinking your orange juice, you may have been drinking more water than real orange juice. You can find out for sure and then impress your friends and family.

There is a lot of water in most of the fruits that we eat. Tomatoes for example have more water than any other fruit coming in with a whopping 97% water. The least amount of water in any fruit is the date with only 20% water. It is no wonder that dates have such a little bit of water considering that they are grown in mostly desert type environments where water is very scare.

Fruits are good for you because they contain fiber, protein and all kinds of good vitamins. And fruit has virtually no fat which is also very good for your diet. Bananas and dates are big in protein. Apricots and persimmon have a lot of Vitamin A. Olives and avocados are especially high in vitamin E. Guava is higher in fiber than any other fruit.

To do this project you will need a scale, a knife, some fruit (preferably oranges), aluminum foil and paper plates.

You will have to observe some procedures to do the experiment as follows:

You will have to weigh the orange, the paper and aluminum foil, and then cut the orange in very thin slices Spread the slices over the paper. Place the paper over the aluminum foil.

Select a warm place to leave the orange. It may take about a day, more or less for the drying to take effect. A light or a fan will speed up the drying process. After the orange slices are dry, make an accurate weighing. Do not weigh the paper and the foil with the orange. Weigh the paper and aluminum foil separately and record the results. Use a precise scale for more accuracy. Weigh the final dry orange slices to calculate the weight loss caused by drying. You want to weigh the orange slices before and after drying to determine how much weight was lost during the drying process.

To figure out the percentage of solids in the orange, divide the weight of dry sample by the weight of original sample. You will probably find out that the orange is approximately 80% water. Repeat the above procedures with your pineapple or any other fruit or vegetable that you wish and determine which fruit or vegetable has the most water.

READ ON to see more about this juicy project.



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