Posted by **Jecce** on Monday, July 21, 2008 at 5:29pm.

ohh im sorry i also have another problem i don't understand.

"A rectangular solid measures 1.0 m by 5.6 cm by 2.1 dm. Express its volume in cubic meters, liters, cubic inches, and cubic feet."

i don't even know what dm means !

Someoneee please help me!

- chemistry -
**Ms. Sue**, Monday, July 21, 2008 at 5:38pm
Here's the definition of dm.

http://www.answers.com/topic/decimeter-decimetre-dm

Check your text materials for these conversions.

- chemistry -
**Ms. Sue**, Monday, July 21, 2008 at 5:55pm
Give it a try. We'll be glad to check your answers.

- chemistry -
**DrBob222**, Monday, July 21, 2008 at 6:19pm
Note to Jecce.

You should know all of the prefixes and all of the metric conversions or have a way in your mind to figure them out. Here is a simplified table

K = kilo

H = hecto

Da = deca

unit = meter, liter, second (time), gram

d = deci

c = centi

m = milli

To change from one unit to the other just move the decimal point to the left if moving up the table and move the decimal point to the right if moving down the table. How many places do we move the decimal point? One place for each unit we move. For example, to change 120 mm to m we move up the chart 1 to centi, 1 more to deci and 1 more to m or a total of 3 places. Since we moved UP the table, we move the decimal point to the left and 120 mm becomes 0.120 m. Voila!.

See your earlier post for a site that gives all of the prefixes.

For conversions from metric to English, or the reverse, I remember a few conversion factors but not very many. I know there are 2.54 cm = 1 inch, 12 inches = 1 ft, 231 cubic inches = 1 gallon, 144 square inches = 1 square foot and 1728 cubic inches = 1 cubic foot.

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