Chapter 4:SPECIFIC GRAVITY IN WOOD

Question 1

Defined as mass per unit volume; the quantity of a
matter into a unit volume of materials

Answer 1

DENSITY

Question 2

Relationship between the mass of the substance and how much volume it takes up

Answer 2

DENSITY

Question 3

The mass of atoms, their size, and how they are
arranged determine the density of a substance

Answer 3

DENSITY

Question 4

The ratio of the oven-dry weight of wood to the weight
of water with volume similar to that of the wood at
specified moisture content.

Answer 4

SPECIFIC GRAVITY

Question 5

The density of water w/ a temperature of ___ or _____ is commonly used as reference to compute SPECIFIC GRAVITY

Answer 5

4°C; 39°F

Question 6

In computing the specific gravity of wood at various conditions, what is used as denominator?

Answer 6

volume of the wood

Question 7

In computing the specific gravity what is used as numerator?

Answer 7

Oven dry weight

Question 8

DENSITY AND SPECIFIC GRAVITY IN WOOD IS AN INDICATOR OF:

Answer 8

• Strength property
• Utilization value of wood
• Processing qualities of wood
• Measure of the amount of cell wall substances and
  the air spaces in the wood.

Question 9

Regarded to be the most extensively used indicator of wood quality

Answer 9

SPECIFIC GRAVITY

Question 10

Specific Gravity wood classification:

Answer 10

a. high specific gravity
b. moderately high specific gravity
c. medium specific gravity

Question 11

High specific gravity = __________

Answer 11

0.701 and above

Question 12

Moderately high SG = ___________

Answer 12

0.601-0.700

Question 13

Medium specific gravity = ____________

Answer 13

0.501-0.600

Question 14

WAYS OF DETERMINING SPECIFIC GRAVITY:

Answer 14

1. GRAVIMETRIC METHOD
2. FLOATATION METHOD
3. MAXIMUM MOISTURE CONTENT METHOD
4. X-RAY DENSIOMETRY METHOD

Question 15

The weight and volume of regular shaped wood are considered.

Answer 15

GRAVIMETRIC METHOD

Question 16

The wood is allowed to float on water and submerge portion will approximate the specific gravity.

Answer 16

FLOATATION METHOD

Question 17

The weight and volume of regular and irregular shaped wood.

Answer 17

MAXIMUM MOISTURE CONTENT METHOD

Question 18

The wood is placed over the film and exposed to an x-ray and when the film is developed, then the specific gravity is determined.

Answer 18

X-RAY DENSIOMETRY METHOD

Question 19

________________ provides highly accurate measurements of wood density and non-destructive, preserving the integrity of the wood sample for further analysis.

Answer 19

X-RAY DENSIOMETRY METHOD

Question 20

___________ formula are used to derive or determine the specific gravity of wood at various moisture contents when at least one specific gravity value at a certain moisture condition is given.

Answer 20

BROWNE’S

Question 21

Density and Specific Gravity provide insights into the _____________, such as strength, hardness, and durability.

Answer 21

physical properties of wood

Question 22

T/F Density is a dimensionless ratio that compares the density of a material to the density of water.

Answer 22

False

Question 23

If wood has a specific gravity of 1.00, it means its density ____ that of water

Answer 23

equals

Question 24

T/F Gravimetric method provides highly accurate measurements of wood density and non-destructive, preserving the integrity of the wood sample for further analysis.

Answer 24

False