scientific measurement

Measurement

is the determination of the dimensions, capacity, quantity, or extent of something. In chemical laboratories, the most common types of it are those of mass, volume, length, time, temperature, pressure, and concentration.

Measurement Systems

English System of Units and Metric System of Units

English System

• Common measurements of commerce, such as those used in a grocery store.

• The units of this system include the inch, foot, pound, quart, and gallon.

Metric System

• It is used in scientific work. The units of this system include the gram, meter, and liter.

• It is superior to the English system. Its superiority stems from the interrelationships between units of the same type (volume, length, etc.). Are less complicated than English unit interrelationships because this system is a decimal unit system. It can be accomplished simply by moving the decimal point to the right or left an appropriate number of places. Thus, simply more convenient to use.

The meter (m)

is the base unit of length in the metric system.

The gram (g)

is the base unit of mass in the metric system.

Mass

is a measure of the total quantity of matter in an object.

Weight

is a measure of the force exerted on an object by gravitational forces.

constant

The mass of a substance is a _____; the weight of an object varies with the object’s geographical location.

For example, matter weighs less at the equator than it would at the North Pole because the pull of gravity is less at the equator.

The liter (L)

is the base unit of volume in the metric system.

rounding off

When calculator answers contain too many digits, it is necessary to delete (drop) the nonsignificant digits, a process that is called

conversion between temperature scales

When converting from the given Degree Celsius to the target unit which is Kelvin. Substitute the given number of Degree Celsius then add the constant 273.

In contrast,

when converting from the given Kelvin to the target unit which is Degree Celsius. Substitute the given number of Kelvin then subtract the constant 273

conversion between temperature scales

when converting from the given Degree Fahrenheit to the target unit which is Degree Celsius. Review about PEMDAS for the operation.

Whereas,

when converting from the given Degree Celsius to the target unit which is Degree Fahrenheit. Review about PEMDAS for the operation.