Latent heat
The amount of heat absorbed or released to change the state of a unit mass of a substance, without changing its temperature, is called the latent heat of that substance of that state. The unit of latent heat in the CGS system is calories/gram. The SI unit of latent heat is joule/kg. Difference Between Latent …
What is Saturated Vapour Pressure?
When an enclosed space can no longer hold additional vapour at a given temperature, the space is said to be saturated. The pressure exerted by the trapped vapour on the container is called the saturated vapour pressure.
A test tube partially filled with water and tilted slightly is partially immersed in a beaker of water Why does the partially airy submerged part of the test tube appear shiny?
A test tube partially filled with water and tilted slightly is partially immersed in a beaker of water Why does the partially airy submerged part of the test tube appear shiny? Answer: A test tube partially filled with water and partially immersed in a beaker with a slight tilt makes the partially airy submerged part …
Why does silver turn black or green when it is old?
Why does silver turn black or green when it is old? Or, why does a silver coin blacken when exposed to sulphuretted hydrogen? Answer: Air contains small amounts of H2S gas. This H2S gas reacts with silver to produce black-coloured silver sulphide. As a result, gradually, i.e. when old, silver sulphide deposits on shiny silver …
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Why do oil paintings turn black?
Explain why do oil paintings turn black when exposed to hydrogen sulphide gas (present in air) due to lead compounds in oil paints. Answer: Oil paints contain lead compounds. This compound reacts with H2S in the air to produce black-coloured lead sulphide (PbS). As a result, the old oil painting becomes black. Pb + H2S …
Why is there a difference between the sound produced by blowing into the mouth of a small homoeopathic vial or key and the mouth of an empty test tube?
Why is there a difference between the sound produced by blowing into the mouth of a small homoeopathic vial or key and the mouth of an empty test tube? Answer: Blowing into the mouth of a small homoeopathic vial or key produces a shrill sound, but blowing into the mouth of an empty test tube …
The same current is passed through two wires of the same type for 1 minute and 5 minutes respectively
The same current is passed through two wires of the same type for 1 minute and 5 minutes respectively. How many times the heat generated in the second wire will be the heat generated in the first wire? Answer: If the current and the resistance of the conductor remain unchanged, the heat generated in the …
How will the sun look through red and blue glass together?
How will the sun look through red and blue glass together? Answer: If red and blue glasses are placed next to each other and viewed through them, the sun will appear black. Because red light emitted through red glass will be absorbed by the blue glass. As a result, no colour from the sun will …
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What would the sun look like through a red glass?
What would the sun look like through a red glass? Answer: If you look at the sun through a red glass, it will appear red. Because red glass absorbs all the colours except red, which are the seven colour of light coming from the sun. Only the red colour reaches our eyes without being absorbed …
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