Question

What are the normal diameter of rebar used in residential rebar?

1) 10mm
2) 12mm
3) 16mm
4) 20mm

Answer 1

The common rebar diameters used in residential construction are 12mm and 16mm. To determine density, use the mass-to-volume ratio with the rebar's displaced water volume.

Step-by-step explanation:

The normal diameter of rebar used in residential construction typically ranges from 10mm to 20mm. However, the most common sizes are 12mm and 16mm. The specific size used can depend on the requirements of the construction project and the local building codes.

To determine the density of rebar, we can use the mass-to-volume ratio. According to the provided information, the volume of the piece of rebar is calculated from the difference in water displacement before and after the rebar is submerged:

• Volume = 22.4 mL - 13.5 mL = 8.9 mL

Next, we convert this volume to cubic centimeters (as 1 mL = 1 cm³):

• Volume = 8.9 cm³

Assuming we have the mass of the rebar, we can calculate the density using the formula:

• Density = Mass / Volume

If the density of the rebar is similar to that of iron (approximately 7.87 g/cm³), this would support the statement that rebar is mostly iron.