Dim Wannabee needs ISA help
Thread Starter
Join Date: Apr 2000
Location: West Midlands, UK.
Age: 73
Posts: 294
Likes: 0
Received 0 Likes
on
0 Posts
Dim Wannabee needs ISA help
I understand that temp an be stated as ISA (or indeed JSA) plus or minus a figure
eg: Temperature is ISA + 7.
What I'm really stuck with is the nature of the calculation. Does it require one to apply the correct mathematical technique as in:
ISA = - 57 so ISA + 7 would be - 50 and ISA = -57 and so ISA -7 would be -57 - (-7) = -57 + 7 = -50
Both can't be right.
Many thanks for any help
eg: Temperature is ISA + 7.
What I'm really stuck with is the nature of the calculation. Does it require one to apply the correct mathematical technique as in:
ISA = - 57 so ISA + 7 would be - 50 and ISA = -57 and so ISA -7 would be -57 - (-7) = -57 + 7 = -50
Both can't be right.
Many thanks for any help
Do a Hover - it avoids G
Join Date: Oct 1999
Location: Chichester West Sussex UK
Age: 91
Posts: 2,206
Likes: 0
Received 0 Likes
on
0 Posts
The easiest way is to use words and common sense not maths.
ISA +X means X degrees warmer than the relevant ISA temp
and
ISA -X means X degrees colder than the relevant ISA temp
Which of course is your first case
ISA +X means X degrees warmer than the relevant ISA temp
and
ISA -X means X degrees colder than the relevant ISA temp
Which of course is your first case
Thread Starter
Join Date: Apr 2000
Location: West Midlands, UK.
Age: 73
Posts: 294
Likes: 0
Received 0 Likes
on
0 Posts
Thank you for the reply which if I understand correctly means my examples now read:
ISA = - 57 so ISA + 7 would be - 50 (warmer)
ISA = -57 so ISA -7 would be -64 (colder)
ISA = - 57 so ISA + 7 would be - 50 (warmer)
ISA = -57 so ISA -7 would be -64 (colder)