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5 85 In Cm Convert

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5' 8.5" in Centimeters: A Step-by-Step Conversion Guide



The conversion of units is a fundamental skill in numerous fields, from engineering and construction to everyday life. Understanding how to convert measurements accurately ensures precision and avoids costly errors. This article focuses on the conversion of the height 5 feet 8.5 inches (5' 8.5") into centimeters (cm), a metric unit commonly used internationally. We will break down the process step-by-step, explaining the mathematical concepts involved, and address common questions to solidify understanding.

Understanding the Units:

Before diving into the conversion, we need to clarify the units involved. We are working with the imperial system (feet and inches) and the metric system (centimeters). The imperial system is based on arbitrary units, whereas the metric system is a decimal system, making conversions within the system simpler. Key relationships we need to know are:

1 foot (ft) = 12 inches (in)
1 inch (in) ≈ 2.54 centimeters (cm) (The "≈" symbol means approximately equal to, as the conversion factor is actually a more precise value, but 2.54 is sufficiently accurate for most purposes)

Step-by-Step Conversion:

Our goal is to convert 5 feet 8.5 inches into centimeters. We will accomplish this in two main steps:

Step 1: Convert feet to inches:

Since 1 foot equals 12 inches, we first convert the 5 feet into inches:

5 ft 12 in/ft = 60 in

This calculation shows that 5 feet is equivalent to 60 inches. Notice how the "ft" unit cancels out, leaving us with the desired unit of "in". This is a crucial concept in unit conversion – ensuring the units cancel appropriately validates the calculation.

Step 2: Convert total inches to centimeters:

Now we have a total of 60 inches (from the feet) + 8.5 inches = 68.5 inches. We will convert this total into centimeters using the conversion factor 1 in ≈ 2.54 cm:

68.5 in 2.54 cm/in ≈ 174.04 cm

Again, notice how the "in" unit cancels, leaving us with the final unit of "cm". Therefore, 5 feet 8.5 inches is approximately equal to 174.04 centimeters.


Mathematical Concepts Illustrated:

This conversion exercise highlights several key mathematical concepts:

Unit Conversion: This is the process of changing a measurement from one unit to another, while maintaining the same value. We used dimensional analysis, a technique that involves manipulating units algebraically to ensure the correct units are obtained.

Multiplication and Addition: Basic arithmetic operations are crucial for this type of calculation. We used multiplication to convert feet to inches and inches to centimeters, and addition to combine the inch measurements.

Significant Figures: The original measurement (5' 8.5") has three significant figures. The conversion factor (2.54 cm/in) has three significant figures. Our final answer (174.04 cm) should ideally reflect this level of precision. However, in many practical scenarios, rounding to 174 cm might be sufficient depending on the level of accuracy required.

Approximation: The conversion factor of 2.54 cm/in is an approximation. The actual conversion is more precise, but 2.54 cm/in provides sufficient accuracy for most practical purposes.


Example Scenarios and Applications:

Understanding unit conversion is essential in various situations:

International Travel: Many countries use the metric system. Knowing how to convert units is crucial for understanding measurements like height, weight, and distances.

Construction and Engineering: Accuracy in measurements is paramount in these fields. Converting between imperial and metric units is essential to ensure projects are built to specifications.

Medical Applications: Medical records often require conversions between systems of measurement for consistency and clarity.


Summary:

Converting 5 feet 8.5 inches to centimeters involves a two-step process: converting feet to inches, adding the inches, and then converting the total inches to centimeters using the conversion factor of 2.54 cm/in. This process demonstrates the fundamental principles of unit conversion, utilizing dimensional analysis and basic arithmetic operations to obtain an accurate result of approximately 174.04 cm.


Frequently Asked Questions (FAQs):

1. Why is the conversion factor 2.54 cm/in approximate? The inch is defined in relation to the meter, and the conversion factor is a result of this relationship. The value 2.54 is a rounded approximation for practical purposes.

2. Can I use a different conversion factor? While 2.54 cm/in is widely used and sufficiently accurate, more precise conversion factors exist, but they are generally unnecessary for everyday conversions.

3. What if I need to convert centimeters back to feet and inches? You would reverse the process. Divide the centimeters by 2.54 to get inches, then divide the inches by 12 to get feet and the remainder would be the inches.

4. Are there online calculators for unit conversion? Yes, many online calculators are available to perform unit conversions quickly and accurately.

5. Is it important to use significant figures in my answer? Yes, paying attention to significant figures ensures the accuracy and precision of your calculations reflect the precision of the original measurements. Rounding appropriately is crucial for reporting results.

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