Air purifiers
Both the reading and the lecture are about "Air purifiers". According to the text, air purifiers protect human beings from the air pollutants and provides three most commonly used types of air filters. On the other hand, the professor explains that these air purifiers are not effective as it seems and discusses shortcomings of each filter mentioned in the passage.
First and foremost, the passage begins by asserting HEPA filters which are used to remove allergens such as pollens or dust from the atmosphere by using folded fiber sheets. Toxic substances get trapped in the fiber when particles come into contact with it. Therefore, cleans the surrounding air. However, the speaker states that HEPA filter does not remove tiny particles from the air. The particles and microbes of less than 0.3 micrometer pass through fiber sheets and released back into the air. Thus, HEPA filters are useful in removing large particles but not small ones.
Next, the professor further delves into the details by pointing that ozone generating air purifiers are dangerous to use. High concentration of ozone can eliminate bad odor from the atmosphere but it reacts with the skin, eyes and other body parts and causes long term damage. It's effect is basically similar to exposing to gasoline. Hence, this is not an efficient air purifier. These claims refutes the writer's implication about ozone generating air filters. According to the reading, ozone reacts with harmful chemicals in the air and eliminates unpleasant smell. Moreover, ozone works as an air freshener.
Ultimately, the article wraps its argument by declaring third kind of air filter which is UV air purifier. UV air purifier remove microscopic particles by directly interacting with the air and hazardous bacteria. In contrast, the speaker rebuts this point by showing the inaccuracy of the author that UV filters does not effectively clean the air. It improves the quality of air but does not eliminate fumes of cigarette and other chemicals. Thus, this air purifier cannot protect humans from air pollution.
| Post date | Users | Rates | Link to Content |
|---|---|---|---|
| 2021-04-06 | Safa Arshad | 80 | view |
| 2021-01-25 | Safa Arshad | 76 | view |
| 2021-01-11 | talelaldabous | 76 | view |
| 2021-01-02 | bhimsen | 76 | view |
| 2020-12-19 | arun-kum6 | 80 | view |
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Grammar and spelling errors:
Line 5, column 399, Rule ID: POSSESIVE_APOSTROPHE[1]
Message: Possible typo: apostrophe is missing. Did you mean 'writers'' or 'writer's'?
Suggestion: writers'; writer's
...t air purifier These claims refutes the writers implication about ozone generating air ...
^^^^^^^
Transition Words or Phrases used:
but, first, hence, however, if, moreover, so, therefore, third, thus, in contrast, kind of, such as, on the other hand
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 8.0 10.4613686534 76% => OK
Auxiliary verbs: 2.0 5.04856512141 40% => OK
Conjunction : 15.0 7.30242825607 205% => Less conjunction wanted
Relative clauses : 7.0 12.0772626932 58% => More relative clauses wanted.
Pronoun: 15.0 22.412803532 67% => OK
Preposition: 41.0 30.3222958057 135% => OK
Nominalization: 4.0 5.01324503311 80% => OK
Performance on vocabulary words:
No of characters: 1711.0 1373.03311258 125% => OK
No of words: 334.0 270.72406181 123% => OK
Chars per words: 5.12275449102 5.08290768461 101% => OK
Fourth root words length: 4.27500489853 4.04702891845 106% => OK
Word Length SD: 2.56092355389 2.5805825403 99% => OK
Unique words: 174.0 145.348785872 120% => OK
Unique words percentage: 0.520958083832 0.540411800872 96% => OK
syllable_count: 541.8 419.366225166 129% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 0.0 3.25607064018 0% => OK
Article: 0.0 8.23620309051 0% => OK
Subordination: 0.0 1.25165562914 0% => More adverbial clause wanted.
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 0.0 2.5761589404 0% => More preposition wanted as sentence beginning.
Performance on sentences:
How many sentences: 1.0 13.0662251656 8% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 334.0 21.2450331126 1572% => The Avg. Sentence Length is relatively long.
Sentence length SD: 0.0 49.2860985944 0% => The essay contains lots of sentences with the similar length. More sentence varieties wanted.
Chars per sentence: 1711.0 110.228320801 1552% => Less chars_per_sentence wanted.
Words per sentence: 334.0 21.698381199 1539% => Less words per sentence wanted.
Discourse Markers: 118.0 7.06452816374 1670% => Less transition words/phrases wanted.
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 1.0 4.19205298013 24% => OK
Sentences with positive sentiment : 0.0 4.33554083885 0% => More positive sentences wanted.
Sentences with negative sentiment : 1.0 4.45695364238 22% => More negative sentences wanted.
Sentences with neutral sentiment: 0.0 4.27373068433 0% => More facts, knowledge or examples wanted.
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.515159219959 0.272083759551 189% => OK
Sentence topic coherence: 0.515159219959 0.0996497079465 517% => Sentence topic similarity is high.
Sentence topic coherence SD: 0.0 0.0662205650399 0% => Sentences are similar to each other.
Paragraph topic coherence: 0.365336545962 0.162205337803 225% => OK
Paragraph topic coherence SD: 0.165791040681 0.0443174109184 374% => More connections among paragraphs wanted.
Essay readability:
automated_readability_index: 169.7 13.3589403974 1270% => Automated_readability_index is high.
flesch_reading_ease: -267.53 53.8541721854 -497% => Flesch_reading_ease is low.
smog_index: 0.0 5.55761589404 0% => Smog_index is low.
flesch_kincaid_grade: 133.5 11.0289183223 1210% => Flesch kincaid grade is high.
coleman_liau_index: 13.9 12.2367328918 114% => OK
dale_chall_readability_score: 24.22 8.42419426049 288% => Dale chall readability score is high.
difficult_words: 85.0 63.6247240618 134% => OK
linsear_write_formula: 52.0 10.7273730684 485% => Linsear_write_formula is high.
gunning_fog: 135.6 10.498013245 1292% => Gunning_fog is high.
text_standard: 52.0 11.2008830022 464% => The average readability is very high. Good job!
What are above readability scores?
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Write the essay in 20 minutes.
Rates: 80.0 out of 100
Scores by essay e-grader: 24.0 Out of 30
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.