1. A heat engine converts thermal energy into mechanical energy through various processes. Common heat engines include steam engines and internal combustion engines. 2. Internal combustion engines burn fuel inside the engine, which heats the air and causes it to expand quickly, transferring energy to move the pistons. Common types are diesel, 2-stroke, and 4-stroke engines. 3. Refrigerators and air conditioners work similarly by absorbing heat inside and releasing it outside using a coolant. The coolant absorbs heat inside, is compressed to release heat outside, then cools and repeats the cycle.

1. 6 th Grade Science Chapter 18 Thermal Energy Notes Section 18.3 Chihuly at the New York Botanical Garden

4. A steam engine is one of the earliest heat engines. A fire box heats steam. The steam drives a piston that is connected to a drive shaft. The drive shaft is connected to the wheels of the train.

7. Four cycle internal combustion engine

8. Two cycle internal combustion engine

16. Opened in November 2005, the indoor resort features an 60-meter high indoor mountain with 5 slopes of varying steepness and difficulty, including a 400-metre-long run, the world's first indoor black run, and a 90-metre-long quarter pipe for snowboarders. A quad lift and a tow lift carry skiers and snowboarders up the mountain. Adjoining the slopes is a 3,000-square-metre Snow Park play area comprising sled and toboggan runs, an icy body slide, climbing towers, a snowball shooting gallery, an ice cave and a 3D theatre. Other attractions include a mirror maze and a snowman-making area. Winter clothing, ski and snowboard equipment are included.