Dear . . . . . . . . , date Thank you for your letter. I write to you about homework in my home. We have a house and we have a lot of homework. Mostly does homework my mother. We have a big house and there are a lot of rooms. My mother dusts the shelves twice a week. My mum likes very much flowers and she has a lot of flowers and then she must to water the flowers. Always does the lundry my mum. She does the lundry three times a week. We have a huge garden too and there is a lot of work. My mum plants flowers and does weeding of flowerbeds. In home I must to mow the lawn, thats not a problem for me. I mow the lawn of my neighbour too. I like to mow the lawn. And I must keep the heading system working
and a light detector set to one side (often 90°) of the source beam. Particle density is then a function of the light reflected into the detector from the particles. To some extent, how much light reflects for a given density of particles is dependent upon properties of the particles such as their shape, color, and reflectivity. Nephelometers are calibrated to a known particulate, then use environmental factors (k-factors) to compensate lighter or darker colored dusts accordingly. K-factor is determined by the user by running the nephelometer next to an air sampling pump and comparing results. Nefelomeeter [1] on statsionaarne või portatiivne instrument kontsentratsiooni mõõtmiseks tahkete osakeste vedelik või gaas kolloid.Nefelomeeter meetmed hõljuvainete kasutades valgusvihu (allikas beam) ja valguse detektor seatud ühele küljele (sageli 90 °) allika kiire. Osakeste
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