# Time elapsed for watch with crystal normal or parallel to g

• Loren Booda
In summary, the approximate fractional difference in time measured between a quartz watch crystal resonating normally or parallelly to Earth's surface gravitation is likely to be negligible due to the stiffness of quartz in weak gravity. However, some propose an experimental test of general relativity using a cesium clock, but it is believed that the clock's orientation will not affect its time keeping as the standard is based on the frequency of light emitted by a Caesium atom, which is random regardless of direction. This experiment has already been conducted.

#### Loren Booda

What is the approximate fractional difference in time measured between a quartz watch crystal resonating either normally or parallelly to Earth's surface gravitation?

Quartz is an extremely stiff material and will deform very little in the Earth's weak gravity. I doubt if the difference would be measurable except under the most stringent lab conditions.

I was thinking more in the way of an experimental test of general relativity which affects the simplified quantum mechanics, thus timing, of such a device. One could also orient a cesium clock in these relative positions.

In my opinion, the orientation of a caesium clock will not affect its time keeping. The standard is based on measuring the frequency of light given by a certain energy transition of a Caesium atom. The direction of emission is random, although a photon 'falling' will have a higher frequency than one 'rising'. This experiment has already been done. All of this you know, of course.

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## 1. What is the difference between a watch with a crystal normal and parallel to g?

A watch with a crystal normal to g means that the crystal is perpendicular to the direction of gravity, while a watch with a crystal parallel to g means that the crystal is parallel to the direction of gravity.

## 2. How does the orientation of a watch's crystal affect the time elapsed?

The orientation of a watch's crystal does not affect the time elapsed. The time will continue to pass at the same rate regardless of the crystal's orientation.

## 3. Can the position of a watch's crystal affect its accuracy?

Yes, the position of a watch's crystal can affect its accuracy. If the crystal is parallel to g, it can cause a slight variation in the timekeeping due to the effects of gravity on the internal workings of the watch.

## 4. Are there any advantages to having a watch with a crystal parallel to g?

There are some advantages to having a watch with a crystal parallel to g. This orientation can reduce the effects of shock and impact on the watch, making it more durable. It can also make the watch more accurate in certain positions, such as when lying flat on a surface.

## 5. Is it better to have a watch with a crystal normal or parallel to g?

It ultimately depends on personal preference and the intended use of the watch. For everyday wear, a watch with a crystal normal to g may be more practical and accurate. However, for activities that involve a lot of movement and potential impact, a watch with a crystal parallel to g may be more suitable.