31 terms

# Pearson Science & Technology: Chapter 3, Lessons 1-5

#### Terms in this set (...)

complex
To be complex is to have many parts.
trend
A trend is the general direction that something tends to move.
sample
A sample is a portion of something that is used to represent the whole thing.
metric system
The metric system is a measurement system based on the number 10.
SI
Modern scientists use a version of the metric system called the International System of Units, or SI.
mass
Mass is a measure of the amount of matter in an object.
weight
Unlike mass, weight is a measure of the force of gravity acting on an object.
volume
Volume is the amount of space an object or substance takes up.
meniscus
To measure the volume of a liquid, read the level at the bottom of the meniscus, or curve.
density
Density is a measure of how much mass is contained in a given volume.
estimate
An estimate is an approximation of a number based on reasonable assumptions.
accuracy
Accuracy refers to how close a measurement is to the true or accepted value.
precision
Precision refers to how close a group of measurements are to each other.
significant figures
The significant figures in a measurement include all digits measured exactly, plus one estimated digit.
percent error
Percent error calculations are a way to determine how accurate an experimental value is.
mean
The mean is the numerical average of a set of data.
median
The median is the middle number in a set of data.
mode
The mode is the number that appears most often in a list of numbers.
range
The range of a set of data is the difference between the greatest value and the least value in the set.
anomalous data
Data that does not fit with the rest of a data set is anomalous data.
graph
A graph is a "picture" of your data.
linear graph
A line graph in which the data points yield a straight line is a linear graph.
nonlinear graph
The kind of graph in which the data points do not fall along a straight line is called a nonlinear graph.
model
In science, a model is any representation of an object or process.
system
A system is a group of parts that work together to perform a function or produce a result.
input
Input is the material or energy that goes into a system.
process
Process is what happens in a system.
output
Output is the material or energy that comes out of a system.
feedback
Feedback is output that changes the system in some way.
safety symbol
Safety symbols alert you to possible sources of accidents in a laboratory.
field
Some of your science investigations will be done in the field, or any area outside a science laboratory.