# What weighs 400 kg is how many pounds

### Weights

you surely know from your daily life in many areas, such as your body weight in kg (= kilograms).

Strictly speaking, this means mass and not weight, but you are welcome to say both.

You measure masses with scales. You probably know your bathroom scales. Maybe you also have kitchen scales. You will learn how they work in physics class.

You probably remember that:

1 g = 1000 mg
1 kg = 1000 g
1 t = 1,000 kg = 1,000,000 g

The following are still used:

1 pound = 500 g
1 quintals = 50 kg

• “Kilo” means 1000, so one kilogram is 1000 grams.

• Milli means thousandths.

You are sure to say “I weigh 50 kilograms” in everyday life and not “I weigh 50 kilograms”. Kilo actually only means 1000, as with kilometers. Colloquially everyone knows that you mean kilograms. Always say the correct unit in math.

### Examples of crowds

Grain of sand: 0.2 mg

Housefly: 80 mg

Image: fotolia.com (Carola Schubbel)

Cent piece: 2.3 g
Pencil: 5 g

Image: iStockphoto.com (chris scredon)

A4 sheet: 5 g
CD: 15 g

Image: Anders ARTig Werbung + Verlag GmbH

Pack of tissues: 25 g
Chicken egg: 60 g
Chocolate bar: 100 g
Small smartphone: 120 g

A packet of butter: 250 g = \$\$ 1/2 \$\$ pounds

Image: Minkus IMAGES photo design agency

### Further in kilograms and tons

1 liter of water: 1 kg

Image: Stefan Zimmermann

Eleven year olds: about 40 kg
Sack of cement: 50 kg = 1 quintals

Image: Dieter Rixe

Leo: 250 kg
Horse: 500 kg
Cow: 750 kg

Image: fotolia.com (Wolfgang Jargstorff)

Smaller car: 1000 kg = 1 t
Elephant: 6 t
Full school bus: 20 t
Blue whale: 100 t
Eiffel Tower in Paris: 10,000 tons

Image: fotolia.com (Frank Haub)

Earth: 6,000,000,000,000,000,000,000,000 kg

One liter is the volume of a cube with an edge length of 10 cm.

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### Estimating weights / masses

How many grams or kilograms do you need roughly when you cook? Sometimes it comes in handy if you can quickly estimate the weight.

Estimate means that you are giving the approximate mass (weight) of something.

To do this, you compare what you are looking for with a crowd that you know.

Here is a somewhat difficult example, namely Asterix and Obelix. Asterix has a weight of 30 kg. Then what does Obelix weigh?

Image: ASTERIX®- OBELIX® / © 2016 LES EDITIONS ALBERT RENE / GOSCINNY - UDERZO

If you know these masses, you have many estimates under control:

• A dime weighs about 2 g.
• A bar of chocolate weighs 100 g.
• One liter of water weighs 1 kg.
• A car weighs around 1000 kg.

### Solution of the estimation problem

Stack one Asterix on top of the other:

You can see that Obelix is ​​about 1.5 times the size of Asterix.

When estimating, a sense of proportion is completely ok! Otherwise you can also measure with a set square or ruler.

You can see that Obelix's belly is about three times as wide as that of little Asterix.

Since the belly also goes backwards, the Obelix is ​​three times as thick at the back as Asterix. Overall, Obelix is ​​1.5 \$\$ * \$\$ 3 \$\$ * \$\$ 3 = 13.5 times as heavy as its friend. That is then about 30 \$\$ * \$\$ 13.5 = 405 kg.

So Obelix weighs around 400 kg. Too heavy It's a comic, a lot is possible. :)

When estimating crowds, you should always keep in mind that they are bodies. Bodies have a length, a width, and a height. So when comparing masses, you should calculate length times width times height.

Image: ASTERIX®- OBELIX® / © 2016 LES EDITIONS ALBERT RENE / GOSCINNY - UDERZO

### Tip:

If you don't have a set square, just use a strip of paper to compare.