2007-01-24 14:21:15 · 6 answers · asked by query 1 in Science & Mathematics ➔ Medicine
the germs evolve?
2007-01-24 14:25:16 · answer #1 · answered by Anonymous · 0⤊ 0⤋
if you mean why do we use 70% isapropyl alcohol instead of a stronger %, it's because it works just as well as a higher % and is safer and cheaper. Alcohols still kill germs at higher %, but more is not always better. Children have been poisoned by cooling alcohol baths and that lead to finding a lower strength that would still kill germs and pose less risk.
2007-01-24 14:34:14 · answer #2 · answered by lynn y 3 · 0⤊ 0⤋
Studies have shown that the combination of 70% isopropyl alcohol and 30% water does a better job of killing bacteria than other combinations. I must mention that 70% alcohol can be contaminated with certain bacteria and that care must be taken to prevent that contamination of the alcohol remaining in the bottle.
2007-01-26 04:44:15 · answer #3 · answered by lfzatz 2 · 0⤊ 0⤋
70+90/2=80%
2016-03-29 01:12:54 · answer #4 · answered by ? 4 · 0⤊ 0⤋
Some water is required for the ethanol (EtOH) to disinfect. Absolute EtOH will dehydrate the microbes quickly, and the EtOH will not be able to enter/kill the cell easily.
2007-01-24 16:01:16 · answer #5 · answered by joie_du_cor 3 · 0⤊ 0⤋
because they do
2007-01-24 14:24:42 · answer #6 · answered by Michael Johnson 1 · 0⤊ 0⤋