Common questions

What is wood specific gravity?


What is wood specific gravity?

Specific gravity is a term used in woodworking and construction that describes the density of wood compared to water. The specific gravity of wood varies greatly between species and helps to determine which type of wood is ideal. Denser woods tend to swell and shrink more than less dense varieties.

What is specific gravity and density in wood?

Technically specific gravity is the measure of a wood’s density as compared to water. If wood were the same density as water, the specific gravity would be 1.00. If it’s less than one—and most wood is less than one—then it’s going to float.”

What is specific gravity of trees?

Specific gravity for woods is determined by measuring the weight at a specific moisture content level. (The common formula looks like this: Wg = Wd(1 + M/100) and will be fairly consistent within a species.) This numerical value, as mentioned earlier, is actually a comparison to pure water.

Why is specific gravity of wood important?

The specific gravity (SG) of wood is a measure of the amount of structural material a tree species allocates to support and strength.

Why is wood specific gravity important?

Wood specific gravity which is a way of expressing how much wood substance is present per unit volume, is the most important within species wood characteristic because knowledge about it allows the prediction of a greater number of properties than any other trait (Zobel and Talbert, 1984; Bowyer and Smith, 1998).

What is basic specific gravity?

Specific gravity is defined as the ratio of the density of a substance to the density of water. Basically, any material with a specific gravity of higher than 1.0 sinks in water. Note that the definition of specific gravity for wood is different from other materials.

What are the different types of specific gravity of wood?

Wood Species Types in Alphabetical Order

Common Name Botanical Name Specific Gravity
Abati Timbary Hymenaea courbaril 0.83
Abbihal Erythrophloeum densiflorum 0.68
Abecou Tieghemella heckelii 0.60
Abeille Manilkara bidentata 0.95

What is the world’s hardest wood?

Australian Buloke
1. Australian Buloke – 5,060 IBF. An ironwood tree that is native to Australia, this wood comes from a species of tree occurring across most of Eastern and Southern Australia. Known as the hardest wood in the world, this particular type has a Janka hardness of 5,060 lbf.

What is the use of finding specific gravity?

Significance and Use 4.1 Specific gravity is an important property of fluids being related to density and viscosity. Knowing the specific gravity will allow determination of a fluid’s characteristics compared to a standard, usually water, at a specified temperature.

What is the specific gravity of plywood?

Specific Gravity (SG) Settings for OSB and Plywood. When measuring plywood, OSB and MDF, avoid taking readings over obvious defects, voids or very rough areas, over nails or screws as well as or where sheets are joined. This will result in inaccurate readings. For accurate readings, the material thickness needs to be a minimum of ½” (12.7mm).

What is the difference between density and specific gravity?

Density and specific gravity are both indications of how much mass a substance would occupy in a given volume. The main difference between density and specific gravity is that density is the mass per unit volume of the substance whereas specific gravity is a ratio comparing the density of one substance to the density of another reference substance.

What is the specific gravity of soil?

The specific gravity of soil particles lay within the range of 2.65 to 2.85. Soils containing organic matter and porous particles may have specific gravity values below 2.0. Soils having heavy substances may have value above 3.0.

What is the specific weight of wood?

With the specific gravity around 1.5, solid wood “substance”, or lignocellulose as it is commonly called today, weighs around 1500 kg/m 3 (93.6 lb/ft 3 ), at theoretical most…no air, water, or other fluids in cell pores, which would decrease the weight of the wood per unit of volume.