during cost analysis you will also compare the proposed cost elements with i actual costs ii previous cost estimates for same or similar work iii other cost estimates iv independent government estimates and v forecasts of planned expenditures
How Decibels Apply to Music and Sound. In music, decibels are a measurement of Sound Pressure Level (SPL). When we say the speakers at a rock concert are playing at 110dB, what we really mean is that theyâre playing at 110dB SPL. Since the decibel is only a ratio, 110dB is actually a comparison to a different number: 0 SPL.
Purdue Universityâs Chemistry Department gives you examples of noise sources for each decibel level: 1  50 dB (1/4th as loud as 70 dB) - Quiet conversation at home. 2  60 dB (1/2 as loud as 70 dB, fairly quiet) - Conversation at a restaurant. 3  70 dB (upper 70s are annoyingly loud) - Running a vacuum cleaner.