Nothing really. Lasers may come closest.
A CNC foam cutter could probably cut any soft material, since the heated wire would likely be able to slice through it.
No, a part or slice of a substance will have the same density as the whole piece, provided that it is made of the same material and has not been altered in any way (e.g., through changes in temperature or pressure). Density is an intensive property, meaning it does not depend on the amount of substance present. However, if the slice is mixed with another material or if its temperature changes, its effective density could differ.
The material through which a wave travels is called the medium.
Your phrasing is unusual; acid is generally thought to dissolve, rather than to slice. But in any event, stomach acid begins the process of digesting protein in particular.
Incorrect. Any material that allow electric current to pass through it is a conductor.
Electricity can pass through a wide verity of material that are conductive.
Glass is a material that allows light to pass through and enables visibility due to its transparent properties. Additionally, plastics like acrylic or polycarbonate can also be used as transparent materials that allow light transmission and visibility.
An opaque material, such as metal or wood, does not allow any light to pass through it. This is because the material absorbs or reflects all incoming light, preventing it from transmitting through the object.
Opaque.
Light is not refracted when while it passes through a vacuum, or through any uniform material.
Either use an offset club, or try and turn your hands over through the ball, both these will prevent a slice.
Dorsal