**For the Metric Challenged**

A yard and a meter are roughly the same (although the difference is significant, treating them as the same can help one gain a sense of size or scale).

0 degrees Celsius is where water freezes, 100 degrees Celsius is where it boils, and 20-25 degrees is typically comfortable room temperature.

A quart and a liter are pretty close.

1 kilogram is roughly 2 pounds.*

A millimeter can be thought of as the width of your fingernail, a centimeter can be thought of as the width of your finger, a decimeter can be thought of as the width of your hand, and a meter as the length of your arm. This one works best on an adult woman in my experience.

Note that these are not conversion factors. These are only little tidbits I've collected and taught over the years to math and science students who have no sense of scale with the metric system. The purpose here is to give you something to relate it to, so a distance like 300 meters has some sort of meaning to you because you can compare it to something.

Then remember that 1 inch is 2.54 centimeters, and that 1 L = 1000 mL = 1000 cc = 1 cubic decimeter, and that 1 L of water is 1 kg.

*I'm aware that it's a bit misleading to compare a unit of mass to a unit of weight, but it's the only thing that seems to make any sense to people! The proper comparison should be grams to slugs or pounds to Newtons, but no one uses slugs or Newtons very much in the general public!