Işık Yılı
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Tanım
Işığın bir yılda vakumda aldığı yol: yaklaşık 9,461 trilyon kilometre.
Açıklama
Despite its name, a light-year is a unit of distance, not time. It equals about 5.879 trillion miles or 63,241 astronomical units.
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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.
Elektron Volt
Bir elektronun 1 voltluk potansiyel farkında kazandığı kinetik enerjiye eşit enerji birimi.
Astronomik Birim
Dünya ile Güneş arasındaki ortalama mesafe: 149.597.870.700 metre.