Chapter 1: Problem 58
Fahrenheit temperatures and Celsius temperatures are related by the formula \(C=\frac{5}{9}(F-32) .\) An experiment requires that a solution be kept at \(50^{\circ} \mathrm{C}\) with an error of at most \(3 \%\) (or \(1.5^{\circ}\) ). You have only a Fahrenheit thermometer. What error are you allowed on it?
Short Answer
Step by step solution
Convert Celsius to Fahrenheit
Calculate Permissible Celsius Error
Convert Celsius Error to Fahrenheit Error
Determine Allowed Fahrenheit Error
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Fahrenheit to Celsius
The formula for converting a Fahrenheit temperature to Celsius is:
- \(C = \frac{5}{9}(F - 32)\)
If you have a Fahrenheit temperature, simply plug it into the formula to find the equivalent Celsius degree. For instance, if the Fahrenheit thermometer reads \(122^{\circ}F\), the equivalent Celsius temperature is calculated as:
- \(C = \frac{5}{9}(122 - 32) = 50^{\circ}C\)
Celsius to Fahrenheit
The conversion equation is:
- \(F = \frac{9}{5}C + 32\)
If you need to find the Fahrenheit equivalent of a Celsius temperature, for example, \(50^{\circ}C\), use the formula:
- \(F = \frac{9}{5} \times 50 + 32 = 122^{\circ}F\)
Error Analysis in Temperature Measurement
For example, if the target temperature is \(50^{\circ}C\) with a permissible error of \(\pm 1.5^{\circ}C\), the allowable Celsius temperature range is from \(48.5^{\circ}C\) to \(51.5^{\circ}C\). To find the equivalent Fahrenheit error, both endpoints of the Celsius range are converted to Fahrenheit.
Converting \(51.5^{\circ}C\) results in \(124.7^{\circ}F\), while \(48.5^{\circ}C\) gives \(119.3^{\circ}F\). Therefore, the Fahrenheit temperature should range from \(119.3^{\circ}F\) to \(124.7^{\circ}F\), providing an allowable error of \(\pm 2.7^{\circ}F\) around the \(122^{\circ}F\) target.
Such precision in defining the margin of error helps prevent significant discrepancies that could affect experiment outcomes. It's vital to recognize this range for the integrity of data and results.
Formula for Temperature Conversion
The two primary formulas are:
- From Fahrenheit to Celsius: \(C = \frac{5}{9}(F - 32)\)
- From Celsius to Fahrenheit: \(F = \frac{9}{5}C + 32\)
It's important to understand these formulas thoroughly as they ensure that measurements remain consistent and comparable, no matter the origin of the data. Whether you're working in a laboratory, cooking, or tracking the weather, this knowledge facilitates exact measurement conversions.