Victor 7th Grade Science Metric Measurement

a way to solve a problem and search for an answer in an orderly and systematic way.

• - state the problem
• - gather background information for a hypothesis
• - design and perform experiment
• - record and analyze data
• - state a conclusion

ten which makes measurements easier and it is used world wide so data can be easily analyzed and communicated.

By definition, length is the distance between 2 points.

The meter is the basic unit of length in the metric system.

Centermeters (cm) are the numbered lines on a meter stick.

There are 100 centimeters in a meter.

A meter is slightly longer than a yard.

The tool used to measure length is the metric ruler.

By definition, mass is the amount of matter in an object.

The basic unit of mass in the metric system is the gram.

The tool used to measur mass is the triple beam balance.

• Weight is the response of mass to the pull of gravity.
• Weight will change if you go to the moon, mass does not.

The triple beam balance measures in grams (g).

Volume is the amount of space an object takes up.

Liter is the basic unit of volume in the metric system.

• Length  X   Width   X   Height (cm³)
• is the formula used to find the volume of a regular object.

The displacement method is used to find the volume of an irregular object.

Volume of object = Final volume  - Initial Volume

DON'T FORGET TO SUBTRACT!!!

Density is the mass per unit volume of a substance.

Density is a combination of both weight and volume.

• D = M/V
• Density equals mass divided by volume.

The units for density are g/ml or g/cm³

Water has a density of 1g/ml.

Objects with a density of greater than 1g/mL will......sink.

Objects with a density of less than 1g/mL will....  float.

Floating or sinking is based on density NOT weight.  Heavy things don't sink and light things don't float.  (Remember the Port Jeff Ferry)

Yes, density is constant for any substance or object.

NO.  Density does not change with mass or volume.

When you cut an object in half, the density of an object will remain the same.

The meniscus of a liquid is the curve in the upper surface of a liquid close to the surface.

Weight is the force on the object due to gravity.