Chicago's yearly precipitation comes in at an average of about 36 inches (910 mm), but during the summer, rain arises from short-lived hit-or-miss rain rather than actual prolonged rainfalls, and thunderstorms also occur with regularity at night. In a normal summer, temperatures exceed 90 Â°F (32 Â°C) on 23 days.
You might have heard someone mention flue spaces for rack storage, and wondered what flue spaces are and why they are needed. Flue spaces are clear lines of sight from the floor up to the ceiling within rack storage areas. There are two types of flue spaces - transverse flues and longitudinal flues.
Looking at the center star in the sword with a pair of binoculars or a small telescope, small fuzzy patch of interstellar gas and dust is visible, called the Orion Nebula. Space is not empty. The matter in the space between the stars is called interstellar matter or the interstellar medium. The interstellar medium consists of atoms, ions, and molecules of gas and dust grains. It is both concentrated into clouds and spread out between stars and the clouds.