The Janka Hardness Scale rates the hardness of hardwood flooring and bamboo as well. You can read more about the Janka Scale and see a list of the Janka Hardness Ratings from FindAnyFloor here http://www.findanyfloor.com/hardwood/JankaHardnessRatings.xhtml
According to the Janka Hardness Scale Acacia rates at 1750 lbs in a sq inch.
European Oak in many ways in similar on the Janka scale as Ameriacan Oak at 1360.
Poplar has a rating of 540.
in regards to a child's temperament, what is the Thomas,Chess, Birch scale?
The Janka hardness scale measures the resistance of a wood species to wear and denting. However, the blackthorn (Prunus spinosa) is not commonly listed on the Janka hardness scale due to its limited use in commercial applications. In general, blackthorn is known to be a very hard and dense wood, similar to other fruitwoods like cherry and plum, which typically have Janka hardness values ranging from 950 to 1200 pounds-force.
Given that there are dozens of different kinds of wood, all of various hardnesses, one should define "regular wood" when asking such a question. Regardless, the short answer to your question is "no." California Redwood is a very soft wood, which is rated at about 400 on the Janka Hardness Scale, and Brazillian Ebony is one of the hardest woods, rated at about 3,700 on the Janka Hardness Scale. By comparison, most plywood is made of birch and/or mahogany, which are rated at about 1,300 and 2,200, repsectively. The hardest plywood is sometimes made of teak, which is rated at about 3,500, which falls short of Brazillian Ebony by about 200 points on the Janka Hardness Scale.
White Oak is 1360 Northern Red Oak is 1290
Birch is generally harder than poplar. The Janka hardness test, which measures the resistance of wood to indentation, shows that birch has a hardness rating of about 1,260 lbf, while poplar averages around 540 lbf. This makes birch a better choice for applications requiring durability, while poplar is often used for its workability and lighter weight.
Rubber tree wood is relatively soft and falls on the lower end of the Janka Wood Hardness Scale. Its hardness varies depending on the specific species of rubber tree, but it is typically in the range of 600-900 lbf (pounds-force).
Janka Boga died in 1963.
Janka Boga was born in 1889.