Eggs that you buy from the store will not stay fresh for long  without refrigeration. Eggs that come right from the chicken can  kept at room temperature for weeks. Store bo â¦ ught eggs should be  refrigerated within a few hours of buying them just to be safe.ven with its natural (but easily cracked) calcium-carbonate container, a hard-cooked egg is a perishabl â¦ e food, so it shouldn't be kept at room temperature for more than two hours.   If kept in an unbroken shell and in the refrigerator about a week.
The human range is commonly given as 20 to 20,000 Hz, though there is considerable variation between individuals, especially at high frequencies, and a gradual loss of sensitivity to higher frequencies with age is considered normal. Sensitivity also varies with frequency, as shown by equal-loudness contours.
Normal Respiratory Rate â Respiration-Breathing Frequency. Respiratory rate (respiration rate, breathing frequency, breathing rate, ventilation rate, pulmonary ventilation rate, and respiratory frequency) is the number of breaths that a person takes during one minute.edical textbooks suggest that the normal respiratory rate for adults at rest is only 10-12 breaths per minute. Older physiology textbooks often provide even smaller values (e.g., 8-10 breaths per minute), while more recent textbooks can give up to 15-18 breaths per minute.