- #1

dnt

- 238

- 0

is that correct?

also, 150 has 2 sig figs but 150. has 3...right?

thanks.

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- Thread starter dnt
- Start date

- #1

dnt

- 238

- 0

is that correct?

also, 150 has 2 sig figs but 150. has 3...right?

thanks.

- #2

NateTG

Science Advisor

Homework Helper

- 2,452

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dnt said:

is that correct?

also, 150 has 2 sig figs but 150. has 3...right?

thanks.

You've got it.

Actually, it's probably better form to write it as:

[tex]7.4 \times 10^{5}[/tex]

Since that will leave no doubt about whether the zeros are significant.

- #3

dnt

- 238

- 0

regarding the "150 vs 150." - i know how many sig figs it has but can someone explain WHY the decimal at the end makes the 0 significant in 150. compared to only 150?

- #4

whozum

- 2,221

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150. is read as 150.0

- #5

DB

- 501

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umm..i don't think so, i think 150.0 has four sig figs, 150. has three, and 150 two.whozum said:150. is read as 150.0

dnt, the decimal in 150. is just a way of saying that, to the limits of your measuring tool, for example: this stick is exactly 150. metres , not 149, not 151, but 150.

and in the case of 150.0, it would be implied that your measuring tool can measure to the tenth of a metre and for example you could say: this stick measures exactly 150.0 meters, not 150.1 not 150.2, but 150.0, though you know nothing about the second decimal place. it could be 150.01, 150.0[1-9], u don't know, its too precise for ur measuring tool. u get it?

- #6

HallsofIvy

Science Advisor

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- #7

whozum

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DB said:umm..i don't think so, i think 150.0 has four sig figs, 150. has three, and 150 two.

i didnt say it IS 150.0, it is understood as 150 and nothing else. exactly 150, it has 3 significant figures.

- #8

DB

- 501

- 0

sorry, i missunderstood ur statement

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