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5 May 2016, 11:04 | Updated: 5 May 2016, 11:09
UK astronaut Tim Peake has also told pupils how he has grown up to three centimetres during his time there.
Major Peake also revealed the existence of a secret drawer of sweets and sugary treats on the station as he spent 10 minutes being quizzed by youngsters from Ashfield Primary School in Otley, West Yorkshire, while he flew above them at 17,500mph.
As well as asking him whether he had grown in space, the youngsters used the special link-up to find out that he does not get lonely because it so busy, and that he never washes his trousers.
Among the children asking the questions were Dalton Briscoe, three, and Esme Thorpe, four, who are thought to be the youngest ever to ask live questions of astronauts on the ISS.
Esme asked Maj Peake how she could come and see him in space.
He said: ``I wish you could come and see me. I'd love to show you around the International Space Station. But you'd need to jump on a rocket and you'd need to travel up to 17,500mph. So that's really fast.
``Maybe it's better if I come and see you in a few weeks time when I'm back on Planet Earth.''
Asked by Ethan Hawke, 11, how tall he was now after five months in space, Maj Peake said: ``That's a very good question, and I haven't actually measured myself. I don't know quite how tall I am, but I did sit in my Soyuz seat the other day and I noticed that I was taller than when I launched.
``So, probably, about two or three centimetres taller.''
And Libby Evans, 10, asked if he gets lonely.
He said: ``No, I never get lonely because there's always so much to do up here. And, as well as working with my crew mates, we're talking every day with mission control centres all around the world. So we get to talk to lots of other people as well.''
Jack Wray, seven, asked Maj Peake: ``Is there space candy?''
The astronaut replied: ``This is secret between you and me but, yes, there is space candy. We have a candy drawer on board the space station and there are things like chocolate in there and all sorts of sugary fizzies, but we're not allowed to eat too many of them.''
Maj Peake told Amelia Whiteley-Davies, 10, how there was a definite smell in space which was difficult to describe - but was a metallic, burning odour.
And he confirmed to Kitty Meggitt, nine, that there were no washing machines on the ISS, meaning he had to wear the same pair of trousers for three months before throwing them away.
Maj Peake signed off saying: ``It's been lovely talking to everybody at Ashfield Primary School in Yorkshire. I hope you're having a nice sunny day.''
The whole school packed into the hall for the link-up which was facilitated by Amateur Radio on the International Space Station (ARISS).
The children had made special helmets for the broadcast and the staff were in ``space suits'' as they entered the hall through a specially created ``air-lock''.