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20 Cards in this Set
- Front
- Back
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why is food frozen? |
storage, easy transport |
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what is the average temperature of a freezer? |
between -24 or -18 |
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what does freezing do to microbes? |
does not kill microbes, makes them dormant; stops them from reproducing; slows their actions down |
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how long can food be frozen for |
up to a year |
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how should someone defrost food? and why? |
put it in the fridge, if not the outside will defrost first in the room temperature, which is perfect for microbe reproduction, and the inside will still be defrosting while microbes are reproducing on the outside |
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what does refrigeration do? |
slows bacteria down, does not stop it |
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how long can food be stored in the fridge? |
a few days |
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what does dehydration do? |
removes moisture from foods so microbes cannot reproduce |
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how is dehydration achieved? |
hot air is blown over the food |
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which foods can be dehydrated? |
milk, eggs, potato, fish |
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how can you eat dehydrated foods? |
add water to it |
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why is dehydration useful |
food is light and compact |
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how does sterilization using a pressure cooker work? |
cooks meat really quickly to kill of microbes by boiling water at a higher temperature than normal |
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can cooking kill microbes with spores? |
no |
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how does bottling work? |
fruit and syrup is put into a jar which is then heated and let to cool. The air then shrinks and creates a vacuum so no oxygen is present so microbes cannot grow |
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how does canning work? |
food is sealed in a can then heated up to kill microbes. |
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how does pickling with vinegar work? |
the acid in the vinegar kills the microbes |
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how does salting work? |
it draws moisture out of the bacterial cells using osmosis which kills them |
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how does smoking work? |
contains substances which kill bacteria |
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How does food irradiation work? |
radiant energy is used to destroy parasites, moulds and yeast and salmonella |
