# رفتار کا کنورٹر

> درست عوامل سے ⁨mph⁩ کو ⁨km/h⁩، ⁨km/h⁩ کو ⁨mph⁩، ⁨m/s⁩ اور ناٹ میں بدلیں؛ اس کے علاوہ ⁨ft/s⁩، سطح سمندر پر ماخ اور روشنی کی رفتار بھی دستیاب ہیں۔

انٹرایکٹو صورت: https://www.calcopenly.com/ur/conversion/speed-converter
موضوع: اکائیوں کے مبدل

Each speed unit is a fixed number of metres per second. The road and sea units are exact: a mile per hour is 0.44704 m/s because the mile is 1,609.344 m, a kilometre per hour is 1/3.6 m/s, and a knot, one nautical mile per hour, is 1,852/3,600 m/s.

The default converts 60 mph to 96.56064 km/h, the figure a UK or US driver needs on metric roads. Sailors and pilots work in knots, and 1 knot is exactly 1.852 km/h.

Mach is fixed here at 340.294 m/s, the speed of sound in the International Standard Atmosphere at sea level and 15 °C, and results that use it are marked approximate because the real speed of sound falls with temperature. The speed of light is exactly 299,792,458 m/s by definition.

## اندراجات

- **قدر**: اصل اکائی میں عدد، یا اپنی اکائی کے ساتھ عدد
- **سے** (اختیارات: metre per second (m/s), kilometre per hour (km/h), mile per hour (mph), knot (kn), foot per second (ft/s), kilometre per second (km/s), Mach (sea level) (Ma), speed of light (c))
- **میں** (اختیارات: metre per second (m/s), kilometre per hour (km/h), mile per hour (mph), knot (kn), foot per second (ft/s), kilometre per second (km/s), Mach (sea level) (Ma), speed of light (c))

## نتائج

- تبدیل شدہ قدر — بنیادی نتیجہ
- اکائی کی تبدیلی
- تبدیلی کا عامل
- درستی

## فارمولا

$$
\begin{gathered} x_{\text{to}} = x_{\text{from}} \times \dfrac{f_{\text{from}}}{f_{\text{to}}} \\ f = \text{one unit expressed in } \text{m/s} \end{gathered}
$$

## حل شدہ مثالیں

### 60 mph in km/h

- قدر: 60 mph
- سے: mile per hour (mph)
- میں: kilometre per hour (km/h)
- **تبدیل شدہ قدر: 96.56064 km/h**
- **درستی: بالکل درست**
- جانچ کا ماخذ: ⁨60 × 1609.344 m / 1000 = 96.56064 km/h (1 mi = 1609.344 m, NIST HB 44)⁩

### 1 knot in km/h

- قدر: 1 kn
- سے: knot (kn)
- میں: kilometre per hour (km/h)
- **تبدیل شدہ قدر: 1.852 km/h**
- جانچ کا ماخذ: ⁨1 knot = 1 nautical mile per hour = 1852 m/h (NIST SP 811 App. B)⁩

### 100 km/h in m/s

- قدر: 100 km/h
- سے: kilometre per hour (km/h)
- میں: metre per second (m/s)
- **تبدیل شدہ قدر: 27.7777777778 m/s**
- **درستی: درست تعریفیں، اعشاریہ دہرایا جاتا ہے**
- جانچ کا ماخذ: ⁨100000 m / 3600 s = 250/9 (Python 3.8 fractions from the legal definitions)⁩

### Speed of light in km/s

- قدر: 1 c
- سے: speed of light (c)
- میں: kilometre per second (km/s)
- **تبدیل شدہ قدر: 299,792.458 km/s**
- جانچ کا ماخذ: ⁨c = 299,792,458 m/s exactly (SI definition of the metre)⁩

### Mach 1 at sea level (approximate)

- قدر: 1 Ma
- سے: Mach (sea level) (Ma)
- میں: kilometre per hour (km/h)
- **تبدیل شدہ قدر: 1,225.0584 km/h**
- **درستی: تقریبی**
- جانچ کا ماخذ: ⁨340.294 m/s (ISA sea level, 15 °C) × 3.6 = 1225.0584 km/h⁩

## سوالات

### How do I convert mph to km/h?

Multiply by 1.609344: 60 mph × 1.609344 = 96.56064 km/h, and 70 mph is 112.65 km/h. The factor is exact because a mile is exactly 1,609.344 m. Multiplying by 1.6 is a mental shortcut that comes out 0.6% low; to go from km/h to mph, multiply by 0.621371.

### How do I convert km/h to m/s?

Divide by 3.6, because an hour has 3,600 seconds and a kilometre 1,000 metres. 100 km/h is 27.78 m/s and 36 km/h is exactly 10 m/s. Multiply by 3.6 to go back: a sprinter at 10 m/s is running 36 km/h, or 22.37 mph.

### What is a knot in mph and km/h?

One knot is exactly 1.852 km/h, about 1.15078 mph or 0.514444 m/s. It is one nautical mile (1,852 m) per hour, the speed unit of shipping and aviation, so a 30-knot wind is 55.56 km/h or 34.52 mph.

### How fast is Mach 1?

In the International Standard Atmosphere at sea level (15 °C) it is 340.294 m/s, which is 1,225.06 km/h or 761.22 mph, the value this converter uses. The speed of sound depends on air temperature, so at 11 km altitude, where the standard atmosphere is −56.5 °C, Mach 1 is about 295 m/s or 1,062 km/h.

### Why is the speed of light an exact number?

Because the metre is defined from it. Since 1983 the metre has been the distance light travels in vacuum in 1/299,792,458 of a second, which fixes c at exactly 299,792,458 m/s, or 1,079,252,848.8 km/h. Converting c into any unit here is therefore exact.

### “⁨رفتار کا کنورٹر⁩” کتنا درست ہے؟

درستی آپ کی درج کردہ قدروں اور طریقے کے مفروضوں پر منحصر ہے۔ اعشاری حساب 50 بامعنی ہندسے استعمال کرتا ہے، مگر تخمینے، عددی طریقے اور ماخذ کا ڈیٹا کم درست ہو سکتے ہیں؛ دکھائی گئی قدروں کو راؤنڈ کرنے سے یہ حدود ختم نہیں ہوتیں۔ آزاد ذرائع کی حل شدہ مثالوں سے جانچ: 5۔ مثلاً، “⁨60 mph in km/h⁩” کو ⁨60 × 1609.344 m / 1000 = 96.56064 km/h (1 mi = 1609.344 m, NIST HB 44)⁩ سے جانچا جاتا ہے۔

### اس طریقے کا ماخذ کیا ہے؟

NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors; NIST Handbook 44, Appendix C — General tables of units of measurement.

## ماخذ

- [NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors](https://www.nist.gov/pml/special-publication-811)
- [NIST Handbook 44, Appendix C — General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)