Chapter 2 Measurements

These flashcards cover key concepts, metrics, and definitions related to measurements as discussed in Chapter 2.

Measurement

A numerical value that includes a unit; crucial for conveying the quantity of a property.

Significant Figures

The digits in a measured number that reflect the precision of the measurement.

Metric Units

Standardized units used in scientific measurements, such as meters, liters, and grams.

Blood Pressure

The force exerted by circulating blood on the walls of blood vessels.

Density

The mass of a substance divided by its volume, often expressed in g/mL.

Conversion Factor

A ratio that expresses how many of one unit equals another unit, used for converting measurements.

Exact Numbers

Numbers that are counted or defined, which do not affect the significance of other measured numbers.

Temperature Conversion

The formula Tf = 1.8(Tc) + 32 is used to convert Celsius to Fahrenheit.

Prefix Symbols

Symbols placed in front of a unit to indicate a multiple or fraction of that unit (e.g., milli, centi, kilo).

Chemical Change

A change that alters the molecular structure of a substance, making it irreversible.

Physical Change

A change that does not alter the chemical composition of a substance; can be reversed.

SI Units

International System of Units, a modern form of metric used worldwide in science.

Metric Prefixes

Symbols that modify the size of a unit, such as kilo (1000) or centi (0.01).

Rounding Off

The process of adjusting a number to a specified degree of accuracy during calculations.

Glucose Concentration

The amount of glucose present in a specified volume of blood, often measured in mg/dL.

Cholesterol Levels

Measures of the amount of cholesterol in the body, categorized into HDL and LDL.

Iron Concentration

The level of iron in the blood, usually measured in micrograms per deciliter (µg/dL).

pH

A scale used to specify the acidity or basicity of an aqueous solution.

Hormone Levels

The concentration of various hormones in the blood, which can affect bodily functions.