Final answer:
Equipment used for sealing joints and cracks includes caulk guns, putty knives, and for larger projects, joint and crack sealing machines. The right sealant type is critical to the process, and 'packing' refers to filling to prevent issues, while 'cracking' can indicate damage needing repair.
Step-by-step explanation:
The equipment used for sealing joints and cracks can vary depending on the scale and type of the project. However, common tools include caulk guns for applying sealant, putty knives for spreading or smoothing sealants, and for larger projects, commercial grade joint and crack sealing machines may be used. It is important to choose the right kind of sealant for the material and type of joint or crack being addressed.
Understanding the difference between 'packing' and 'cracking' is crucial in maintenance and construction. 'Packing' typically refers to filling a joint or crevice to prevent further movement or the infiltration of substances, whereas 'cracking' can refer to the action of creating fractures in a material or the observation of existing fractures. Packing is often used for prevention and maintenance, while cracking usually indicates the need for repair or assessment.
For instructional purposes, using materials such as a large flat tray with raised sides (like a baking tray), water, various types of oils (motor, lighter fluid, penetrating, and cooking oil), and a camera could demonstrate how different substances interact with surfaces and each other. This might aid in understanding how different sealants work and the importance of selecting the right type for a given application.