Mon Prof Augmenté
How We Keep Food Fresh
Age 10 · Daily Life
Open to everyone until Friday, October 30
To keep it, print it while it is open.
Food goes bad when tiny living things called microbes grow in it. Cold, drying, salt, sugar and sealed containers slow those microbes down so food lasts much longer.
In the picture
- Dried apricots: without water, microbes can hardly grow
- Fish in salt: salt pulls the water out of the fish
- Jar of jam: lots of sugar, and a jar that was boiled and sealed
- Frozen peas: freezing stops microbes from growing
Examples
- Milk stays fresh for days in the fridge but turns sour quickly on a warm table.
- Raisins are dried grapes that keep for months in a cupboard.
Key takeaways
- Microbes need water and warmth to grow.
- Cold, drying, salt, sugar and airtight sealing all slow microbes down.
Quiz: How We Keep Food Fresh (Age 10)
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What do microbes need to grow in food?
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Why does packing fish in salt help it last longer?
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What helps jam in a jar stay good for a long time?
The answers, each with its explanation, are in the app. This quiz is free there while the lesson is in the free week.
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