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# difference between notice and circular

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Question:Tell me the exact difference between a right circular cylinder and normal cylinder.

Answers:In a right circular cylinder:the axis of the cylinder is perpendicular to the base of the cylinder. while in a regular cylinder the axis of the cylinder can be having any inclination with the base. Also,the cross section of a right circular cylinder is a rectangle/square while of a normal cylinder it is a parallelogram

Question:any difference between the circular rings and the 6 sided angled rings? can you fit more of one in the same space? do they touch/lie differently? whats the deal? why make them different shapes? why not just one shape and save me from having to ask the question?

Answers:I figure you are talking about ceramic rings and bio balls? They are basically the same thing, and do the same job, they both house beneficial bacteria in your filters. Go with the ones with the bigger surface area so more beneficial bacteria can grow on them. They make them different shapes for the fact that they can, and in some aqauriums bio balls are preferred (eg. saltwater) because they have a bigger surface area and in salt water aquariums that contain just fish, the biological filter is the most important filter it needs. The ceramic rings don't have as big of a surface area, so they are ideal for freshwater aquariums. I would however put both in your filter, or just take your pick. Both work great in filters that have a wet dry system. The ceramic rings are used for the dry part (they aren't actually dry but they aren't submerged in the water but they get moist), and the bio balls are the wet system as they are submerged.

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Question:Still even though they said there's been 23 leap seconds in the last 35 years, the Earth still takes 365 days 5 hours 48 minutes and 46.08 seconds to orbit the sun, or 366 sidereal days 5 sidereal hours 48 sidereal minutes and 46.08 sidereal seconds. So in the last 35 years that means that the Earth slowed down in its rotation 23 times? How is the time of day affected by that? For example if it's 8:15:05 now, it would be 8:15:28 without the leap seconds? I'm confused about all this.

Answers:Time is now measured using stable atomic clocks (International Atomic Time), Leap seconds are necessary because 1. the length of the mean solar day is very slowly increasing, The solar day becomes 1.7 ms longer every century . 2. SI unit second, when adopted, was already a little shorter than the current value of the second of mean solar time. ======================================================================== International Atomic Time (TAI) is the primary international time standard from which other time standards, including UTC, are calculated. TAI is kept by the BIPM (International Bureau of Weights and Measures), and is based on the combined input of many atomic clocks around the world, each corrected for environmental and relativistic effects. It is the primary realisation of Terrestrial Time. Coordinated Universal Time (UTC) is an atomic time scale designed to approximate Universal Time. UTC differs from TAI by an integral number of seconds. UTC is kept within 0.9 second of UT1 by the introduction of one-second steps to UTC, the "leap second". To date these steps have always been positive. Standard time or civil time in a region deviates a fixed, round amount, usually a whole number of hours, from some form of Universal Time, now usually UTC. The offset is chosen such that a new day starts approximately while the sun is at the nadir. See Time zone. Alternatively the difference is not really fixed, but it changes twice a year a round amount, usually one hour