Sublimation is to change from
2 answers:
Answer:
The process in which a solid changes directly into gaseous form, without transcurring to the "intermediate-form" which would be the liquid form.
Explanation:
Some elements or substances can go directly from solid to gaseous form, and that process is called sublimation.
A common example of sublimation would be the sublimation of dry-ice, which is solid . When the temperature of the dry ice reaches -78.5 ºC or higher, it will start becoming a gas.
Remember:
Solid → gas = sublimation
Solid → liquid = fusion
Gas → liquid = condensation
Gas → solid = deposition
Liquid → gas = evaporation
Liquid → solid = solidification
Hope it helped,
BiologiaMagister
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Answer:
Option ‘a’ is the cheapest for this house.
Explanation:
Cheapest method of heating must have least cost per kj of energy. So, convert all the energy in the same unit (say kj) and take select the cheapest method to heat the house.
Given:
Three methods are given to heat a particular house are as follows:
Method (a)
Through Gas, this gives energy of amount $1.33/therm.
Method (b)
Through electric resistance, this gives energy of amount $0.12/KWh.
Method (c)
Through oil, this gives energy of amount $2.30/gallon.
Calculation:
Step1
Change therm to kj in method ‘a’ as follows:
$/kj.
Step2
Change kWh to kj in method ‘b’ as follows:
$/kj.
Step3
Change kWh to kj in method ‘c’ as follows:
$/kj.
Thus, the method ‘a’ has least cost as compare to method b and c.
So, option ‘a’ is the cheapest for this house.