Observations and results
Did you find that the black-eyed peas had a higher level in the cup with the hot water over time compared to in the cup with the ice-cold water?
When dried beans are soaked in water, their volume increases as they absorb the water. Beans absorb hot water more quickly than cold water, which is why the black-eyed peas used in this activity should have swelled faster in the hot water than in the cold water. For example, after only 10 minutes of soaking, you may have seen that the level of the black-eyed peas in the hot water cup was about half an inch higher than the level in the cold water cup, and that this difference remained consistent for the rest of the activity. This activity works well for dried black-eyed peas, split peas and lentils because they do not require extensive soaking before cooking; if you were to test other legumes that require more soaking, you would see that they absorb water much more slowly.
More to explore
So What's a Legume?, from Kids' Health
Is the Soup Ready? Measure How Much Water is Absorbed by Dried Beans, from Science Buddies
Beans and Peas Are Unique Foods, by ChooseMyPlate.gov, United States Department of Agriculture
Science Activities for All Ages!, from Science Buddies
Observations and results
Did you find that the black-eyed peas had a higher level in the cup with the hot water over time compared to in the cup with the ice-cold water?
When dried beans are soaked in water, their volume increases as they absorb the water. Beans absorb hot water more quickly than cold water, which is why the black-eyed peas used in this activity should have swelled faster in the hot water than in the cold water. For example, after only 10 minutes of soaking, you may have seen that the level of the black-eyed peas in the hot water cup was about half an inch higher than the level in the cold water cup, and that this difference remained consistent for the rest of the activity. This activity works well for dried black-eyed peas, split peas and lentils because they do not require extensive soaking before cooking; if you were to test other legumes that require more soaking, you would see that they absorb water much more slowly.
More to explore
So What's a Legume?, from Kids' Health
Is the Soup Ready? Measure How Much Water is Absorbed by Dried Beans, from Science Buddies
Beans and Peas Are Unique Foods, by ChooseMyPlate.gov, United States Department of Agriculture
Science Activities for All Ages!, from Science Buddies
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