It depends on which one radiates heat fastest.
Since plastics are generally poor heat conductors, you'd expect the plastic cup to cool more slowly. But a thin plasic cup, painted black, may radiate more heat than a very shiny metal cup.
No. It is a liquid metal.
A plastic cup holds more heat because plastic can't take out heat. Glass conducts heat away.
Metal, t looks better and will mot likely last longer.
styrofoam, but warning fammable and unsafe for the environment!
Slightly bend the metal until it pops (the metal, not the plastic ;) This will start the hand warmer going. The liquid will crystallize, giving off heat. When done, you can heat it in a pot of hot (near boiling) water and reuse.
Metal, it will last longer since it is sturdier.
Metal is no longer used. Trim and moldings are plastic these days.
Although they might seem more expensive at first the metal units are more cost effective. They last longer than plastic and do not bend or get damaged as easy. With plastic units you may have to replace them every couple of years, depending on how much damage or strain they receive while metal units will last much longer.
Mercury is a liquid metal used in thermometers. However, it becomes a solid at -37.9 F and it can cause mercury poisoning if ingested or inhaled. Therefore, most theremometers use ethyl-alcohol or a plastic strip covered with liquid crystals (called a liquid crystal thermometer).
With using a plastic gas can you eliminate the possiblity of getting rust in the gas. A metal gas can will last longer than a plastic one,and it will not melt as easily.
Plastic in my opinion will last longer, since metal have a larger tendency to rust and become very unattractive when it comes to large amounts of rust.
No there metal not plastic the top has plastic