Which statement about thermal conductivity is FALSE? O a. The thermal conductivity of timber is greater in the longitudinal compared to the radial direction. O b. Lower density results in lower thermal conductivity. O c. Thermal modification of wood reduces its thermal conductivity. Od. Thermal conductivity of air is higher compared to wood.

A block of wood floats in water with 2 inches projecting above the water surface. When placed in Glycerin (SG = 1.35), the block projects 3 inch. %3D above the surface of that liquid. Determine the specific gravity of the wood. Answer: 0.65 TRY AGAIN

wood timber with a diameter of 1 inch has a moisture content of 5%. The fiber saturation point (FSP) for this wood is 28%. The wood shrinks or swells 1% in the radial direction for every 5% change in moisture content below FSP. a) What would be the percent change in the wood's diameter if the wood's moisture is increased to 43%? b) Would the wood swell or shrink? c) What would be the new diameter?

A plate has 0.25 wt% initial carbon concentration and is at 950C. The surface is then exposed t carbon-rich atmosphere so that the concentration of carbon is maintained at 1.25 wt%. How lo it take for the carbon content to reach 0.8 wt% at 0.5 mm below the surface? Diffusivity is 1.6* m2/s.