Students examine standard pressure in this interactive object.

Learners view illustrations showing the direct dependence of the volume of a gas on temperature and consider the relationship between the Kelvin and Celsius temperature scales.

Learners read a description of torque and study the factors that cause its magnitude to change.

Vapor pressure is the pressure exerted by molecules in the gas phase in equilibrium with a liquid or a solid. Two examples are used to illustrate vapor pressure: the drying of clothes and the evaporation of ice.

Students review the rule for writing the possessive form of singular nouns that end in an "s" sound. They then complete exercises.

In this animated object, learners examine neutral fats, phospholipids, and cholesterol. The molecular formula and general function for each are shown.

Learners read about the most common forms of financial statements including balance sheets, cash flow statements, and profit and loss statements. A brief quiz completes the activity.

The student identifies the anatomical parts of the ear and learns the purpose and function of these parts. A review follows the lesson.

In this screencast, learners read about the parts of the eye.

In this animated object, learners read a brief description of the roles of the hypothalamus, emotions, and adrenal secretions during the stress response.

Learners examine how the boiling point increases with increasing pressure. An example from industry is given.

In this highly interactive object, learners associate basic line types and terms with engineering drawing geometry. A quiz completes the activity.

Students review the functions of the keys on the Starrett HB400 Optical Comparator controller.

In this interactive object, learners review the case of a patient with meningococcal meningitis.

In this animated object, learners are introduced to the structure and function of animal cell organelles.

This animated object illustrates the events leading to the migration of phagocytes into areas of tissue damage and/or bacterial presence. Learners view bacterial cell phagocytosis, its subsequent enzymatic digestion, and exocytosis.

In this brief object, learners examine the direct relationship between the volume of a gas sample and the number of moles of gas. A problem is presented so students can test their knowledge of Avogadro's Law.

In this animated object, students observe how ATP energy is used to move substances across the cell membrane from an area of lower concentration to an area of higher concentration and when something too large needs to get in or out of a cell.

Learners examine the periodic table to identify metallic elements that have either fixed or variable oxidation states.

Learners examine the meaning of theoretical yield, actual yield, and percent yield. They test their knowledge by solving two problems.