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20. We sneeze due to allergy by dust.
21.Atmospheric pressure, also known as barometric pressure, is the pressure within the atmosphere of Earth. The standard atmosphere is a unit of pressure defined as 101,325 Pa, which is equivalent to 760 mm Hg, 29.9212 inches.
22.Weather is the condition of the atmosphere at a particular place over a short period of time, whereas climate refers to the weather pattern, using statistical data, of a place over a long enough period to yield meaningful averages. Climatology studies climatic change, and is an atmospheric science.
23. A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. ... A chemical change is different from a physical change, which doesn't rearrange atoms or molecules and produce a completely new substance.
24.Some examples of natural indicators are red cabbage and turmeric.
Cooked vegetables or vegetable curry contain turmeric powder and soap is basic in nature. Turmeric is a natural indicator which changes its yellow colour into reddish brown when it comes in contact with a solution of base. Hence, when soap (which is basic in nature) is scrubbed on the stain, the stain turns red.
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Answer:
20. We sneeze when we inhale dust because some dust particles goes into our nose and cause irritation.
21. The force exerted by air, whether compressed or unconfined, on any surface in contact with it.
22. Weather - Weather is the combination of the current meteorological components, e.g. temperature, wind direction and speed, amount and type of precipitation, sun shine hours, etc. The weather is defining a short time period up to several days.
Climate - The climate is describing the long term (min 30 years) and average weather conditions for a specific region. Examples: maritime climate, cold-dry desert climate, tropical climate. Global climate classification maps highlight the high variety of climates. The climate is composed of different components and factors.
23. Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. ... An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.
24. Litmus Paper and Turmeric
25. Vegetable stain turns reddish-brown when washed with soap because vegetable stain contains turmeric. When soap solution is added to it, turmeric turns into reddish-brown color because the soap solution is basic in nature, and on washing off the soap with water the medium is neutral again.
Explanation:
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