250 kilograms is how many pounds? Make sure you have the correct number of sig figs and proper label.
The correct answer and explanation is:
Answer:
250 kilograms = 551 pounds
(rounded to 3 significant figures and labeled properly)
Explanation (300 words)
To convert kilograms (kg) to pounds (lb), we use the standard conversion factor:
1 kilogram = 2.20462 pounds
So, to convert 250 kilograms: 250 kg×2.20462 lbkg=551.155 lb250 \, \text{kg} \times 2.20462 \, \frac{\text{lb}}{\text{kg}} = 551.155 \, \text{lb}
Now, let’s talk about significant figures (sig figs). Significant figures reflect the precision of a measurement. The number 250 kg has 3 significant figures. When performing multiplication, the result should have the same number of significant figures as the input with the fewest significant figures.
In this case:
- 250 kg has 3 significant figures
- The conversion factor (2.20462) is considered exact or has more significant figures than needed
- So the final answer must be rounded to 3 significant figures
Rounding 551.155 to 3 significant figures gives:
551 lb
We must also include the proper unit in the final answer. Since we’re converting mass, “pounds” is the correct unit, abbreviated as lb.
Including units and appropriate sig figs is crucial in science and engineering. It ensures clarity, consistency, and accuracy. Omitting units can lead to confusion or mistakes (e.g., is 551 in grams or pounds?). Using the correct number of significant figures avoids giving a false sense of precision.
In conclusion, 250 kilograms = 551 pounds is correct because:
- It uses the correct conversion factor,
- It’s rounded to 3 significant figures (matching the precision of 250 kg),
- It includes the appropriate unit.
This method reflects careful scientific practice and shows respect for measurement accuracy and communication.