Because it is less dense. The ability of a material to absorb or retain heat is governed by its molecular density, and is known as "specific heat". Wood, which is cellulose, has a much lower density than metals, and will both heat more slowly and cool more quickly in air. Lighter metals, such as aluminum, similarly display a substantially lower ability to retain heat than denser metals such as iron. When cooling materials, light metals or porous wood can be effectively cooled by the air (a low specific heat), while other denser substances are more effectively cooled by water (higher specific heat, and can absorb heat by evaporating).
Wood is more buoyant than metal because wood has a lower density than metal. Buoyancy is a result of the object's density compared to the density of the fluid it is in. Since wood is less dense than metal, it displaces more water and experiences an upward buoyant force that keeps it afloat.
The metal feels colder than the wood because it conducts heat away from our skin faster due to its high thermal conductivity. Wood is a poor conductor of heat, so it feels warmer as it does not draw heat away from our skin as quickly.
Metal, Water, Ice, Plastic
While both may be at the ambient temperature metal conducts heat more efficiently than wood. Consequently heat from the body will flow more quickly and efficiently to the metal than it does to the wood. Hence it feels colder.
Metal is a thermal conductor and wood is a thermal insulator.when you touch the metal the energy transfer rapidlyto the metal,making it colder.when you touch the wood the energy transfer very slowly from your hand to the wood kept in a cold place.
It is not colder. Metal conducts heat better (faster) than wood/wood composites so the metal feels colder because it is removing heat from your hand faster than the desktop.
Metal will conduct heat better than wood. While both the metal and the wood are the same temperature, heat will flow from your hands to the metal very quickly (and you feel cold). When you touch wood, a poor conductor, heat does not flow from you as quickly.
Metal is a better conductor of heat than wood, so when you touch a metal object at room temperature, it conducts heat away from your skin more effectively than a wood object. This rapid transfer of heat creates the sensation of the metal feeling cooler even though both the metal and wood objects are at the same room temperature.
Lets say room temp is 75 degrees. Your body temp is around 98 degrees. metal conducts heat very well so when you touch it all the heat is transferred to the metal whereas wood is more insulating and the heat from your finger leaves at a much slower rate. Also, there is also a difference in emissivity between the two materials. They radiate energy differently. The metal object not only feels colder in the room (or hotter in the sun), it really is a different temperature. Wiki/Google "emissivity." Metal is a thermal conductor and Wood is a thermal insulator. When you touch the metal, the energy transfers rapidly to the metal, making it colder. When you touch the wood, the energy transfers very slowly from your hand to the wood.
Because metal conducts heat faster than wood. The temperature of the water will be carried up to your hand much more efficiently by the metal spoon than a wooden spoon.
PVC pipe has less friction. They are also longer lasting than the others.
This is not a sensible question. There are many types of wood, and many types of metal. It depends which ones you pick. Balsa wood has a very low density, lignum vitae is much higher. Most woods are less dense than water (so they float) but a few are denser. Most metals are more dense than water, but a few, such as sodium and potassium are less dense. Overall, I suppose most metals are denser than most woods, but potassium is less dense than some forms of eucalyptus wood.