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The description for a certain brand of house paint claims a coverage of \(460 \mathrm{ft}^{2} /\) gal. (a) Express this quantity in square meters per liter. (b) Express this quantity in an SI unit (see Appendices \(\mathrm{A}\) and D). (c) What is the inverse of the original quantity, and (d) what is its physical significance?

Short Answer

Expert verified
(a) Approximately 11.29 m²/L; (b) 11.29 m²/L (SI consistent unit); (c) 1 gal/460 ft²; (d) Gallons required per ft².

Step by step solution

01

Convert Units

Start by converting 460 square feet (ft²) to square meters (m²). We know that 1 ft² = 0.092903 m². Hence, \[ 460 ext{ ft}^2 = 460 imes 0.092903 ext{ m}^2. \]Calculate the product to find the equivalent area in m².
02

Area in Metric Units

Perform the multiplication to find the total area in square meters:\[ 460 imes 0.092903 = 42.73538 ext{ m}^2. \]So, 460 ft² is approximately 42.74 m².
03

Convert Gallons to Liters

Now, convert the volume from gallons to liters. Since 1 gal = 3.78541 L, \[ 1 ext{ gal} = 3.78541 ext{ L}. \]
04

Express Paint Coverage in m²/L

We can now find the paint coverage in square meters per liter:\[ \frac{42.74 ext{ m}^2}{3.78541 ext{ L}} \approx 11.29 ext{ m}^2/ ext{L}. \]This is the coverage in m²/L.
05

Express Quantity in SI Units

SI units for area are m² and for volume are m³. Here, we are focusing on two dimensions (area), so we keep our findings in m²/L, which is consistent with SI derived units for volume usage.
06

Find Inverse Quantity

To find the inverse of the original quantity (460 ft²/gal), calculate:\[ \frac{1}{460 ext{ ft}^2/ ext{gal}} = \frac{1 ext{ gal}}{460 ext{ ft}^2}. \]
07

Physical Significance of Inverse

The inverse, \(\frac{1 ext{ gal}}{460 ext{ ft}^2}\), represents the amount of paint in gallons required to cover one square foot. This indicates how much paint is needed per unit of area.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

SI Units
SI Units, or the International System of Units, make measurement uniform and comparable worldwide. They are the standard units of measurement agreed upon by scientists for consistency and ease of communication. For this reason, it is crucial in scientific and technical settings to express quantities in SI Units.
For this exercise, converting paint coverage helps in using a globally recognized standard, beneficial for understanding universally. In the metric system, area is measured in square meters (\(m^2\)) and volume in liters (\(L\)).
Thus, to express paint coverage of 460 square feet per gallon in SI units:
  • Convert square feet to square meters
  • Convert gallons to liters
  • Use the conversion: \[\text{1 ft}^{2} = 0.092903 \text{ m}^{2}\] and \[\text{1 gal} = 3.78541 \text{ L}\]
These conversions result in the coverage expressed as 11.29 square meters per liter. Understanding SI Units provides a foundation to compare with other metric measurements easily.
Unit Inversion
Inversion of units is a common concept in mathematics and science that reveals a different aspect of a measurement. Here, inversion helps understand the quantity from a reciprocal point of view.
When you invert the original paint coverage, which is 460 square feet per gallon, you end up finding how a unit of paint relates to area coverage.
The calculation is straightforward:
  • The original measure: \[\frac{460 \text{ ft}^{2}}{\text{gal}}\]
  • Inverse becomes: \[\frac{1}{460 \text{ ft}^{2/gal}} = \frac{1 \text{ gal}}{460 \text{ ft}^{2}}\]
This inverse helps answer the question: "How much paint in gallons is needed to cover one square foot?" It indicates efficiency per unit area and is handy when considering materials or logistics in painting tasks.
Paint Coverage Calculation
Understanding paint coverage calculations can save time, money, and resources when embarking on a painting project. Calculating paint coverage effectively helps in estimating the amount of paint necessary for a task, preventing wastage, and ensuring adequacy.
In the examined problem, you start with a specific paint coverage measurement: 460 square feet per gallon. The steps for calculating and converting this include:
  • Convert the area from square feet to square meters using the factor \[\text{1 ft}^{2} = 0.092903 \text{ m}^{2}\]
  • Convert the volume from gallons to liters, where \[\text{1 gal} = 3.78541 \text{ L}\]
  • Resulting in coverage approximately \[\frac{42.74 \text{ m}^{2}}{3.78541 \text{ L}} \approx 11.29 \text{ m}^{2/L}\]
Understanding this calculation, including the importance of unit conversion skills, ensures you equip yourself with the right paint amount. It simplifies planning for projects and ensures no excess or shortage of materials.

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