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<p>Lightning involves a near-instantaneous release of <a href="page.php?w=energy">energy</a> on a scale averaging between 200 <a href="page.php?w=megajoule">megajoule</a>s and 7 gigajoules. The air around the lightning flash rapidly heats to temperatures of about 30,000 C. There is an emission of <a href="page.php?w=electromagnetic_radiation">electromagnetic radiation</a> across a wide range of wavelengths, some visible as a bright flash. Lightning also causes <a href="page.php?w=thunder">thunder</a>, a sound from the <a href="page.php?w=shock_wave">shock wave</a></p><p>
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