Std 273: Fill & Download for Free

I feel one of the great Indians whom we actually don’t know is this womanShe is Sheetal Mahajan. The first woman who has performed first jump over Geographic North Pole on 18 April 2004 without any practice.Belonging to a middle class family in Pune, Sheetal was in 12th std when she actually performed this jump.In a society where the number of girls in adventure sports is almost negligible, the biggest challenge Sheetal faced was breaking the stereotypes and antiquated notions associated with women in adventure sports.Now this is beyond imagination…The temperature is below zero degree Celsius. It is freezing everywhere there is only ice to be seen. Your mouth starts frothing in the North Pole. You are clad with many clothes and it is very difficult even to pick up your hand in that chilling weather. Your hands have gone numb freezing, the brain is telling you to stop torturing your body.But this is NO DREAM. It is the true story of this brave-heart.Sheetal Mahajan was a common person like you and me but with an dream which she completed and made herself uncommon. In the colourful college life where you are all lost, Sheetal had a dream, to sky dive from North Pole and South Pole. An middle class girl who couldn’t afford to have such a dream, had to ask over 273 companies for sponsoring her trip to Norway and from there to the pole. A girl who even didn’t step out of Pune, had decided to travel from Pune-Germany- Norway and up to North Pole.Till here everything went fine, but her helicopter which was going to pick her up from Longyearbyen, doorway to North Pole got damaged and Sheetal’s dream would break in any minute. She didn’t lose hope, because she knew she couldn’t again afford to come here to fulfill her dream. Being only a 12th std girl she extended her visa, tried to get veg food and also coping with the harsh climatic conditions of North Pole she was determined to complete her dream and she did it. She parachuted form the North Pole without any training. At that point of time her first parachute was going to tear but her presence of mind helped her and she opened the second parachuteThis is her interview where she tells how she started skydivingIs Shital Mahajan India's most unknown sportsperson even with five world records?Shital Mahajan - Wikipedia

Seems like you have a enmity with curly braces,don't you?Sorry, just kidding.After you write if(<some condition>), it will take up the immediate next statement. i.e. if you write 2 statements after if then only the statement just after the if is linked. The 2nd statement will execute no matter what. So,what happens is that compiler is not able to find an if statement linked with the else if statement. Similarly you should put curly braces on else and while blocks too.And the second wrong thing in your code is that the equality operator is == not =. = is assignment operator and will return true whenever an assignment is successful. It's not an error , but obviously is not what you're trying to do.So the correct code is here:#include <iostream>   using namespace std;   main(){  float det, celsius, kelvin;  cout << "Enter 1 to convert from celsius to kelvin. \nEnter 2 to convert from kelvin to celsius.\n";  cin >> det;    if (det == 1){  cout << "Enter the celsius value : ";  cin >> celsius;    while (celsius < -273){  cout << "celsius value cannot be less than -273.\nPlease state the new celsius value : ";  cin >> celsius; }  kelvin = celsius + 273;  cout << "The kelvin is : " << kelvin;  }  else if (det == 2){  cout << "Enter the kelvin value : ";  cin >> kelvin;    while (kelvin < 0){  cout << "Kelvin value cannot be less than 0.\nPlease state the new kelvin value : ";  cin >> kelvin; }    celsius = kelvin - 273;  cout << "The celsius is : "; } } 

If the air is at the same temperature as the helium, it will never happen.The relative density of air is about 14.2, (error: 28.4, I forgot that these gasses are diatomic. ) and the relative density of helium is 4. (Helium gas is monatomic.)So the helium needs to be 28.4/4 times colder than the air. That is the ratio of the ABSOLUTE temperature of the helium needs to be less than the absolute temperature of the air multiplied by the fraction 4/28.4.If the air is at NTP, Zero C and 1 std Atmosphere, then the absolute temperature of the air is 273 K.273 x 4 / 28.4 = 38.45So at -234.55 C, helium will be just denser than air at NTP.Keeping the Helium and air thermally isolated will be a problem.If the air and the helium are ate the same temperature, the required condition will never occur.