Advertisements
Advertisements
Question
Hot air balloons float in the air because of the low density of the air inside the balloon. Explain this with the help of an appropriate gas law.
Advertisements
Solution
The working of a hot air balloon can be explained with the help of Charles’ law. According to Charles’ law, at constant pressure, the volume of a fixed amount of a gas varies directly with the temperature. This means that as the temperature increases, the air inside the balloon expands and occupies more volume. Thus, hot air inside the balloon is less dense than the surrounding cold air. This causes the hot air balloon to float in the air.
APPEARS IN
RELATED QUESTIONS
Explain Why?
"When stating the volume of a gas, the pressure and temperature should also be given."
What would be the mass of CO2 occupying a volume of 44 litres at 25°C and 750 mm pressure.
State the following:
The absolute temperature of a gas at 7°C
Answer in one sentence.
A bubble of methane gas rises from the bottom of the North sea. What will happen to the size of the bubble as it rises to the surface?
Convert the following temperature from degree Celcius to kelvin.
25° C
Convert 101.325 kPa to bar.
Convert −100° C to kelvin
Identify the gas laws from the following diagram.
| Diagram | Gas laws |
 |
______________ |
Consider a sample of a gas in a cylinder with a movable piston.
Show diagrammatically the changes in the position of the piston, if the temperature is decreased from 400 K to 300 K, and pressure is decreased from 4 bar to 3 bar.
With the help of the graph answer the following -
At constant temperature, the Graph shows the relationship between pressure and volume. Represent the relation mathematically.
With the help of the graph answer the following -
At constant temperature, Write the statement of law.
Solve the following.
The volume of a given mass of a gas at 0°C is 2 dm3. Calculate the new volume of the gas at constant pressure when the temperature is decreased by 10°C.
Solve the following.
A hot air balloon has a volume of 2800 m3 at 99°C. What is the volume if the air cools to 80°C?
The temperatures at which real gases obey the ideal gas laws over a wide range of pressure is called __________.
Use of hot air balloon in sports and meteorological observation is an application of
Explain the following observation.
Aerated water bottles are kept under water during summer
Explain the following observation.
The type of an automobile is inflated to slightly lesser pressure in summer than in winter
At 25°C and 1 atm, a cylinder containing 10 L of an ideal gas is connected to the empty cylinder with a capacity of 20 L. The pressures exerted by gas m both the cylinders will be ____________.
A certain sample of gas has a volume of 0.2 L at one atmosphere pressure and 273.15 K. What is the volume of gas at 273.15°C at same pressure?
According to Andrews isothermals, the minimum temperature at which carbon dioxide gas obeys Boyles law is ______.
According to Andrews isothermals at what temperature the carbon dioxide gas starts to condense at 73 atmosphere?
At what temperature the volume of a gas becomes absolutely zero?
Isochor is the graph plotted between ______.
10 g of gas at one atomospheric pressure is cooled from 273.15°C to 0°C keeping the volume constant. What is the final pressure?
