At room temperature, glass used in windows actually has some properties of a liquid. it has a very slow, viscous flow. (viscosity is the property of a fluid that resists internal flow. for example, lemonade flows more easily than fudge syrup. fudge syrup has a higher viscosity than lemonade.) glass does not become a true liquid until temperatures are greater than or equal to 515515°c. find the fahrenheit temperatures for which glass is a liquid. hint: use the formula