Wood and Paper Flashcards
Lecture 14
What is wood?
The secondary xylem
Wood properties are determined by its…
structure
Who is the largest producer of lumber
United states
Who is the largest exporter of lumber?
Canada
What are Hardwoods?
Angiosperms that have vessels and fibers
What are soft woods?
Gymnosperms with only tracheas
What is the most popular hardwood in the us?
red oak
What is black cherry used for?
Furniture
What is sugar maple used for?
flooring
What is Douglas fir used for?
Lumber
T/F: Teak is very resistant to decay
True
What is ebony?
Dense, heavy wood that can be difficult to work with
What is Balsa
Lightest known wood
What is the hardest known wood?
Lignum Vitae
T/F mahogany is not rare in the wild
False: it is rare in the wild
What causes the “figure” in wood?
Irregular growth of the xylem cells
What causes Birds Eye?
initiation of many tiny buds that then abort
What are burls?
Unusual formations caused by pathogens or damage
What makes plywood so special?
Lightweight, can stick together easily, sturdy
What are veneers?
Thins sheets of wood glued to some other wood surface
What was used as the evolution for writing paper?
clay -> papyrus -> vellum -> silk ->paper
Who invented the paper making machine?
Nicholas Robert
t/f: Acid id good of paper
False