Miscellaneous - Chase-durer Conquest Chronograph Operation Manual

° °
At 68 F (20 C), sound travels at 344m or 376yds / 1,129ft per second in air at sea level.
°
Therefore, at 68 F (20 C) sound
1 mile (1,760 yards / 5,280 feet) in
1,000 yards in
1 kilometer in
To estimate the distance to an event such as
lightning, measure the time from the visual flash
to the sound and multiply the seconds by the
per second speed.
For example the measured lightning to thunder
°
time at 68 F is 10 seconds. 10 x 344m or
376yds / 1,129ft would produce 3,440m or
3,760yds / 11,290ft. (2.14miles)
Alternately, you can divide the measured time at
°
68 F by 4.68 to get miles (10s / 4.68 = 2.14miles),
or 2.66 for thousand yard distance, or by 2.91 for
kilometers.
NOTE:
° °
At 32 F (0 C), sound travels at 332m or 363yds /
1,089ft per second in air at sea level.
°
Therefore, at 32 F (0
1 mile / 1,760 yards / 5,280 feet in
1,000 yards in
1 kilometer in

Miscellaneous

°
will travel:
4.68 seconds
2.66 seconds
2.91 seconds
°
C) sound will travel:
4.85 seconds
2.75 seconds
3.01 seconds
CHASE-DURER
TUE
8
10
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Example: Sea level temp is
lightning to thunder measured time is 17.4
seconds. Distance of lightning strike point
is:
17.4s x 1,129ft = 19,644ft
17.4s x 376yds = 6,542yds
17.4s x 344m = 5,986meters
OR:
17.4s / 4.68s = 3.72 miles
17.4s / 2.66s = 6.54 thousand yards
17.4s / 2.91s = 5.98 kilometers
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68 F and