Ahorizontal tube carrying hot water has a surface temperature of 355.4 k and an outside diameter
of 25.4 mm. the tube is exposed to room air at 294.3 k. what is the natural convection heat loss
for a 1 m length of the pipe?

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

it is negative when a compound forms from elements in their standard states.