Final answer:
To encounter a temperature of 100 degrees Celsius by going upwards is not typically possible in the Earth's atmosphere, as this temperature would likely be found in extreme environments outside of standard atmospheric conditions.
Step-by-step explanation:
The question about what altitude you would need to reach in order to encounter a temperature of 100 degrees Celsius falls into the realm of physics, specifically atmospheric physics. The temperature does not increase with altitude in a uniform manner; rather, it follows a pattern known as the atmospheric temperature profile which consists of different layers. The layer of the atmosphere where you would typically find temperatures around 100°C is not precisely defined by altitude because there can be variations due to weather, geographic location, and other factors. However, this temperature is generally not found in the atmospheres we experience and is more associated with extreme environments such as those found in industrial processes or rocket reentry.