# Kinetic calculation inputs

In addition to the mandatory inputs required for the various [flash calculations](https://devdocs.olisystems.com/group1/api-functions), kinetic calculation inputs need to be specified in **params.kineticsParameters** if there are kinetic reactions defined in the chemistry model.

```javascript
{
    "params": {
        ...<snip>...
        "kineticsParameters": {
            "holdupTime": {
                "value": 100.0,
                "unit": "hr"
            },
            "numberSteps": {
                "value": 10,
                "unit": ""
            }
        }
    }
}
```

| params.kineticsParameters | type                                                           | description                                                                                                                       |
| ------------------------- | -------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------- |
| holdupTime                | [valueObject](https://devdocs.olisystems.com/terms-definition) | holdup time                                                                                                                       |
| numberSteps               | [valueObject](https://devdocs.olisystems.com/terms-definition) | number of kinetics steps used in integrating kinetic rates, more steps lead to higher result accuracy and longer computation time |

### Survey Calculation

Survey calculation is supported for the variables below. Please refer to [Survey calculation](https://devdocs.olisystems.com/survey-calculation) for explained input schema.

| supported **params.surveyInputs\[{}].field**   |
| ---------------------------------------------- |
| "/params/kineticsParameters/holdupTime/value"  |
| "/params/kineticsParameters/numberSteps/value" |


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