Planck Sabiti
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://unitfyi.com/iframe/glossary/planck-constant-def/" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://unitfyi.com/glossary/planck-constant-def/Add a dynamic SVG badge to your README or docs.
[](https://unitfyi.com/glossary/planck-constant-def/)Use the native HTML custom element.
Tanım
6,62607015 × 10⁻³⁴ J·s tam değerine sahip temel fizik sabiti; 2019'dan itibaren kilogramın tanımında kullanılmaktadır.
Açıklama
The Planck constant relates the energy of a photon to its frequency: E = hν. A photon of visible green light (550 nm, 5.45 × 10¹⁴ Hz) has energy of 3.61 × 10⁻¹⁹ J = 2.25 eV. The kilogram is now defined by fixing h to exactly 6.62607015 × 10⁻³⁴ J·s, measured via a Kibble balance — replacing the 130-year-old platinum-iridium kilogram artifact.
RELATED ARTICLES
A complete guide to the four temperature scales in scientific and everyday use—Celsius, Fahrenheit, Kelvin, and Rankine—including their history, conversion formulas, and where they intersect.
Speed Units Guide: MPH, KM/H, Knots, and MachA complete reference for speed units used around the world — from everyday driving speeds to the velocity of light.
Energy Units Guide: Joules, Calories, BTU, and Kilowatt-HoursA complete reference for energy units across physics, food science, electrical engineering, and fuel — with key conversions and real-world examples.
RELATED TERMS
Mutlak Sıfır
Mümkün olan en düşük sıcaklık: 0 K, -273,15 °C veya -459,67 °F.
Kalori
Bir enerji birimi; küçük kalori (cal) 1 g suyu 1 °C ısıtır, besin Kalorisi (kcal) ise 1000 küçük kaloriye eşittir.
Mach Sayısı
Bir cismin hızının, bulunduğu ortamdaki ses hızına oranı.
Işık Yılı
Işığın bir yılda vakumda aldığı yol: yaklaşık 9,461 trilyon kilometre.
Elektron Volt
Bir elektronun 1 voltluk potansiyel farkında kazandığı kinetik enerjiye eşit enerji birimi.