Old Faithful is a cone geyser in Yellowstone National Park in Wyoming, United States. It was named in 1870 during the Washburn–Langford–Doane Expedition and was the first geyser in the park to be named. It is a highly predictable geothermal feature and has erupted every 44 minutes to two hours since 2000. The geyser and the nearby Old Faithful Inn are part of the Old Faithful Historic District.
Eruptions of Old Faithful last between 1.5 and 5 minutes. During this time, the water reaches a height of 106 to 184 feet (32 to 56 meters), with an average height of 130 feet. Between 3,700 and 8,400 gallons of water are expelled from the geyser.
Old Faithful erupts every 60 to 110 minutes, which is about 16 to 17 times per day. On rare occasions, it can take up to two hours for the next eruption. During an eruption, the water temperature at the vent has been measured at 204°F (95.6°C). The steam temperature has been measured above 350°F!
In earlier times, visitors would throw their dirty clothes into the geyser. When Old Faithful erupted, it would spit the clothes back out, steam-cleaning them in the process. Wool clothes disintegrated from the hot steam but other fabrics fared much better.
According to earthtrekkers.coml; en.wikipedia.org. Source of photos: internet
