Learners examine graphs and read that the heat of fusion is the heat energy absorbed by one mole of solid as it is converted to liquid, while the heat of vaporization is the heat energy absorbed by one mole of liquid as it is converted to gas.

In this animated activity, learners explore three major methods of heat transfer and practice identifying each.

In this learning activity you'll calculate exchange rates to determine the impact of prices of exports and imports.

Learners answer questions about the heat treatment of metals using a game show format. Immediate feedback is provided.

In this animated object, learners examine the mechanisms for gas exchange among the lungs, blood, and tissues.

In this interactive learning object, the learner practices sizing a tank-type water heater for one- and two-family residences, townhouses, and apartments with individual water heaters.

In this animated and interactive object, learners examine a heat exchanger as an example of an automated closed-loop system.

Learners examine how CEC, base saturation, and soil pH work with each other to define plant nutrient availability.

Students read about the concept of true power and view examples of how it is dissipated as heat is provided.

In this learning activity you'll review the six different ways in which electricity is produced: chemical, friction, heat, light, magnetism, and pressure.

In this animated object, learners examine synthesis, decomposition, exchange, and reversible reactions.

Learners examine how vapor pressure is calculated. The vapor pressure of a liquid increases with increasing temperature. If the heat of vaporization and the vapor pressure at one temperature are known, the vapor pressure at a second temperature can be calculated.

In this interactive object, learners calculate the amount of heat evolved or absorbed in chemical reactions. Four practice problems are provided.

Learners study the effect that pressure has on boiling temperatures. Once a liquid has reached a full boil, additional heat does not raise the liquid’s temperature; however, pressure can vary the boiling point of a liquid. A brief quiz completes the activity.

Learners examine devices that are used to protect a motor from damage, such as fuses, overload heaters, and thermal protectors. A quiz completes the activity.

Learners examine the operation of the on-off control mode using a home heating example. A short quiz completes the activity.

Learners examine the ways in which a motor starter circuit is protected by a main circuit breaker and overload heaters when there is excessive current.

In this animated object, learners examine how the heating or cooling steps in a manufacturing process work to control a chemical reaction.

In this animated activity, students view the plastic pellets in a profile extrusion machine being melted as the temperature of the heating elements is elevated by a time proportioning control system.