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Unit: Science and Technology Topic: Everyday Appliance Pratomsuksa 6

Magic milk

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Page 1: Magic milk

Unit: Science and Technology

Topic: Everyday Appliance

Pratomsuksa 6

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Vocabulary

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detergent

EX. Are there any detergents in the laundry?

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coloring

Ex. We drop food coloring onto the milk.

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molecule

A water molecule has two hydrogen atoms and one oxygen atom.

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surface tension

The detergent lowers the surface tension of the liquid

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separate

You cannot separate the milk from the coffee once you put it in.

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decrease

This medicine will decrease your pain.

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Structure

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Adjective

An adjective describes how something

'is'. For this reason, we often use the verb 'to

be' when using adjectives. Adjectives are used to describe nouns.

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Rule: Adjectives describe nouns.

Here is a types of sentences we use with adjectives.

Subject + To be + Adjective + Noun

For example:

• Surface tension is an interesting concept.

• This is the colorful milk.

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Milk consists of a lot of different types of

molecules, including fat, protein, sugars,

vitamins, and minerals. If you had just touched a

clean cotton swab to the milk, not much would

have happened.

Magic Colored Milk

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Scientific background

Surface tension is an interesting concept,

like molecules like to stick together. Milk has

surface tension, just like water, but unlike water, it

is high in fat and is solid colored. As the coloring

is less dense, it does not mix into the milk unless

stirred. It remains separate. Dish soap breaks

down the fat of the milk and decreases the surface tension in milk.

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Activity 1. Make a group of five.

2. Do the magic colorful milk experiment.

3. Answer the following questions. - What happens to the food coloring when you

first put it on the milk?

- What happens when you add the drop of dish

washing liquid?

- Is the milk moving? Does the movement go

on forever?

- What happens if you add another drop of

detergent after the colors have stopped moving?

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Science experiment

If you add food coloring to milk, not a whole

lot happens, but it only takes one simple

ingredient to turn the milk into a swirling color

wheel. Here is what you do.

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• 2% or whole milk

Magic Milk Materials

• food coloring

• dishwashing liquid

• cotton swab

• plate

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Magic Milk Instructions

1. Pour enough milk onto a plate to cover the bottom.

2. Drop food coloring onto the milk.

3. Dip a cotton swab in dishwashing detergent liquid.

4. Touch the coated swab to the milk in the center of the plate.

5. Don't stir the milk; it isn't necessary. The colors will swirl on

their own as soon as the detergent contacts the liquid.

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