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 F=9/5C + 32