what conditions are neccesary for substances to be separated by chromatography?why might different solvents be used in chromatography?
Sorry this isnt an answer but a comment to Pattiann. Isnt it amazing that our mothers used to use PINS to fasten our diapers? And you are right they were some mighty big pins! Can you imagine putting something that long and pointy and sharp that close to that area on a baby? If a parent did it today it would be considered child endangerment. Luckily by the time my kids were born they had invented the velcro type fasteners. And thank God they are both long out of diapers now. thanks for the memories and the chuckle.
i wouldnt think it would be the o2 level, but instead an allergen of somesort it could be your bed cloths, mold, perfumes, air freshener, anything with the hint of a smell have you brought anything new into your room lately? does it only happen in your room? do you have gas (heat)? do you keep your doors closed? do you smoke in your room with the door closed? if you have gas heat in your house, it would be a better investment to get a co2 detector
Wireless security systems are more efficient than that of the traditional wired systems. They are easy to install. They offer long-lasting batteries that can last for days in case of a power outage. It allows you to arm and disarm your system, review who has entered and exited, and view photos and videos. So, that you have total access to your home security system whenever you are away from your house.
