High-temperature refers to conditions where the temperature is significantly above the average or normal range. In scientific contexts, it often means temperatures exceeding 100 degrees Celsius (212 degrees Fahrenheit). High temperatures can affect materials, causing them to expand, change state, or even melt, which is crucial in fields like metallurgy and materials science. In everyday life, high temperatures can impact health and safety. For example, extreme heat can lead to heat exhaustion or heat stroke in humans. Additionally, high temperatures can affect the environment, leading to issues like drought or wildfires, which can have devastating effects on ecosystems and communities.