「万が一の場合」vs「念のために」?


How should I decide to choose either「万が一の場合」vs「念のために」?

「万が一」 , by itself, cannot directly substituted for 「念のために」, right? But, adding
「の場合」 makes 「万が一の場合」and「念のために」 pretty much the same?




In meaning, the following can be said:

1.「[念]{ねん}のために」 **≠** 「[万]{まん}が[一]{いち}の[場合]{ばあい}」

2.「念のために」 **≒** 「万が一の場合に[備]{そな}えて」

> 「 **念のために** + (verb phrase)」 means "to (verb phrase) **_beforehand_** just
> in case something happens on an off chance."

But

> 「 **万が一の場合** + (verb phrase)」 means "to (verb phrase) **_in response_** in
> case something happens on an off chance"

That is the huge difference; Thus, I stated #1.

In order to use 「万が一の場合」 to describe what to do in advance, one needs to add
「に備えて」(= in preparation for)、「のために」(= for), etc. to it. This is what I meant
to say in #2.




In meaning, the following can be said:

1.「[念]{ねん}のために」 **≠** 「[万]{まん}が[一]{いち}の[場合]{ばあい}」

2.「念のために」 **≒** 「万が一の場合に[備]{そな}えて」

> 「 **念のために** + (verb phrase)」 means "to (verb phrase) **_beforehand_** just
> in case something happens on an off chance."

But

> 「 **万が一の場合** + (verb phrase)」 means "to (verb phrase) **_in response_** in
> case something happens on an off chance"

That is the huge difference; Thus, I stated #1.

In order to use 「万が一の場合」 to describe what to do in advance, one needs to add
「に備えて」(= in preparation for)、「のために」(= for), etc. to it. This is what I meant
to say in #2.

