A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine and also as a fastener. The mechanical advantage of a screw thread depends on its lead, which is the linear distance the screw travels in one revolution.
Sour cream is a dairy product with a short shelf life. Typically it is good for 2 to 3 weeks from when purchased. Always check the expiration date on the container.
Once opened, heavy whipping cream will stay relatively fresh in the refrigerator for one to two weeks, notes the Wisconsin Nutrition Education Program. After that, discard the cream. Even ultra-pasteurized whipping cream should be stored in the refrigerator once opened. Like standard pasteurized cream, it will last up to two weeks when stored at below 40 degrees Fahrenheit in a refrigerator. The ideal temperature range for storing dairy products, such as whipping cream, is between 34 and 38 F.