in sabhi question ka answer shi shi dena wrna answer hi mat krna
agar galat answer kiya to me apke saree answer report kar du gi !
Answers
Answer:
12 . view pic
13. The latent heat associated with melting a solid or freezing a liquid is called the heat of fusion; that associated with vaporizing a liquid or a solid or condensing a vapour is called the heat of vaporization.
14. a. the temperature at which a substance will melt
b. the temperature at which a liquid turns into a solid when cooled.
c. the temperature at which a liquid starts to boil
15. the temperature of the substance does not rise even when heat is supplied to it. Therefore, interconversion of states of matter occurs at a constant temperature. ... This is because, the heat gets used up in changing the state by overcoming the forces of attraction between the particles
16. The Kelvin scale is used extensively in scientific work because a number of physical quantities, such as the volume of an ideal gas, are directly related to absolute temperature. To convert kelvin to degree Celsius, we use the following formula:TCelsius=TKelvin−273.15 T Celsius = T Kelvin − 273.15 .
17. The three most common temperature scales are Fahrenheit, Celsius, and Kelvin. Temperature scales are created by identifying two reproducible temperatures. The freezing and boiling temperatures of water at standard atmospheric pressure are commonly used.
18. This can be done by the following (any one or more) steps (i) Dry it under the fan Under the fan when the speed of wind increases, the particles of water vapour from the shirt move away with the wind, decreasing the amount of water vapour in the surroundings.
19. When ice melts, it absorbs the energy equal to the latent heat of fusion from the surroundings therefore causes cooling effect. But steam releases the extra heat (equal to the latent heat of vaporization) which it has absorbed when water was converted into steam
20. Factors That Affect the Rate of Evaporation
temperature of the liquid. A cup of hot water will •evaporate more quickly than a cup of cold water.
exposed surface area of the liquid. ...
•presence or absence of other substances in the liquid. ...
•air movement. ...
•concentration of the evaporating substance in the air.
21. As air rises upwards it expands and cool down and then it stops rising when it matches the temperature of surrounding air. ... Cool air can't hold moisture as much as warm air. So moisture condenses into droplets of water and thus forming cloud
22. Evaporation causes cooling because the process requires heat energy. The energy is taken away by the molecules when they convert from liquid into gas, and this causes cooling on the original surface.
23. the statements is not given ...
Q.12
Q.13The latent heat of fusion implies the transformation of a liquid to a solid. The latent heat of vaporization implies the change from a liquid to a gas. The latent heat of sublimation implies the change from a solid to a gas.
Q.14The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts). Keep in mind that a material's melting point is the same as its freezing point.
Q.15The temperature remains constant because heat produced gets used up in changing the state of matter by overcoming the forces of attraction present between the particles.
Q.16Kelvin
Kelvin is an absolute scale for measurement of temperature and unlike others (°C and °F) the scale can be used to measure extreme low and high values of temperature. There is no maximum and minimum temperature that the scale can measure and that makes it the best scale.
Q.17Thermometers measure temperature according to well-defined scales of measurement. The three most common temperature scales are Fahrenheit, Celsius, and Kelvin. Temperature scales are created by identifying two reproducible temperatures. The freezing and boiling temperatures of water at standard atmospheric pressure are commonly used.
Q.18
Q.19When temperature is decreased to 0oC, water turns into ice. Whereas, when temperature is increased to 100oC, water is converted to steam. Water as steam has more latent heat than water in liquid and solid form. Hence, water as steam can cause severe burns while water as ice has a cooling effect.
Q.20The rate of evaporation depends on surface area, temperature, humidity and speed of the wind. It increases with increase in surface area, temperature, and wind speed. But it decreases with increase in humidity.
Q.21As air rises upwards it expands and cool down and then it stops rising when it matches the temperature of surrounding air.Cool air can't hold moisture as much as warm air. So moisture condenses into droplets of water and thus forming cloud.
Q.22Evaporation causes cooling is general process. the principle involved here is the matter must either gain or lose energy to change its state. Here molecules move from liquid to gaseous state and so it needs potential energy and kinetic energy.Hence evaporation causes cooling effect.Some examples are as follows: 1. when tea is poured into a saucer when it is very hot it is exposed to a large area and causes evaporation n the tea becomes cool. 2.In summer seasons the water gets cool in a earthen pot because it has fine pores in it through which water seeps out gets evaporated .
Step-by-step explanation:
need some thanks and brainliest
