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The description for a certain brand of house paint claims a coverage of 460ft2/gal. (a) Express this quantity in square meters per liter. (b) Express this quantity in an SI unit (see Appendices A and D). (c) What is the inverse of the original quantity, and (d) what is its physical significance?

Short Answer

Expert verified
  1. 460ft2/galis equal to 11.3m2/L.
  2. 460ft2/galis equal to 1.13×104m-1
  3. The inverse of 460ft2/galis2.17×10-3ft2/gal.
  4. From the above obtained reciprocal of the coverage of paint, one can find the thickness of the paint.

Step by step solution

01

Given data

The coverage of paint is 460ft2pergallon.

02

Understanding the unit conversion

Chain-link conversions are used for unit conversion in which given values are multiplied successively by conversion factors.

03

(a) Determination of the quantity in square meters per liter.

1 ft = 0.3048 m

1gal=231inch3and1inch3=1.639×10-2L

Therefore,

1 gal = 3.79 L

Thus,

460×(0.304823.79=11.275≈11.3m2L

Thus, the quantity 460ft2/galbecomes 11.3m2/L.

04

(b) Express the quantity in SI units.

The conversion factor is1m3=1000L

Thus, the quantity 460ft2/galbecomes,

11.3m2L×1000L1m3=1.13×104m-1

Thus, the quantity 460ft2/galis equal to 1.13×104m-1.

05

(c) Determination of the inverse

The inverse of460ft2/galis calculated as,

1460ft2/gal=2.17×10-3gal/ft2

Thus, the inverse of is 460ft2/galis2.17×10-3gal/ft2.

06

(d) Physical significance

Since the volume of the paint is to be used to paint the unit area, it is possible to find the thickness of the paint. It is also possible to determine the amount of paint required to paint a certain area with the specified thickness.

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