allotropic forms, n.All

Allotropic forms (n.) are ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠rivals for one supply of stuff: change the temperature and yesterday's loser devours the winner, until at one exact degree neither advances.