Final answer:
When films are kept in a hot room, they can become overexposed, brittle and damaged, and develop more contrast.
Step-by-step explanation:
When a box of films is kept in a hot room, several things could happen. First, the films may become overexposed. This is because the heat can increase the sensitivity of the film to light, causing it to be exposed more than intended. Second, the films may become brittle and damaged. Heat can accelerate the aging process of films, causing them to become more fragile and prone to breakage. Finally, the films may develop more contrast. This occurs because the heat can affect the chemical reactions during film development, leading to an increase in contrast between the light and dark areas of the images.