In this learning activity you'll explore the difference between mass and weight.

Atomic weights are used to convert the mass of a sample into the number of moles of the element in the sample and vice versa. Four examples are provided for practice.

Students read how to determine and calculate the dry unit weight for a given sample of soil or aggregate based on the weight-volume relationship.

Students read how to determine and calculate the saturated unit weight for a given sample of soil or aggregate, based on the weight-volume relationship. Practice problems complete the activity.

Students read about the concept of unit weight relating to the 3-phase diagram and perform calculations.

In this interactive object, learners calculate formula and molecular weights by working through five examples and two problems.

Learners read the definition of atomic weight and obtain the weights of elements by viewing the Periodic Table and charts that list atomic weights by name or symbol.

In this learning activity you'll calculate problems using the negative both inside and outside of the parenthesis.

As a welder, you'll need to know how to convert between standard and metric measurements. Try this activity to practice converting between these two measurements. A conversion chart is provided to help you complete this work.

Learners examine the fundamental operation of a difference operational amplifier. A brief quiz completes the activity.

In this screencast, you'll distinguish the differences between the content message and the relational message.

Learners read definitions of atomic symbols, atomic numbers, and mass numbers and then answer questions about the number of neutrons, protons, and electrons in select elements.

Students read how to determine and calculate the dry density for a given sample of soil or aggregate based on the mass-volume relationship.

Learners examine the method for calculating the atomic weight of copper from the natural percent composition of each of its two isotopes.

In this learning activity you'll practice converting between degree minute second and decimal degree.

Students read how to determine and calculate the porosity for a given sample of soil or aggregate, based on the weight-volume relationship.

Video Overview of turning between centers on a lathe.

In this animated object, learners examine the relationship between pressure and temperature in an air conditioning system.

Students read how to determine and calculate the saturated density for a given sample of soil or aggregate, based on the mass-volume relationship. Practice problems complete the activity.

In this learning activity you'll factor problems using the difference of two perfect squares.